FORMAN, Circuit Judge.
In the amended complaint filed in the United States District Court for the Eastern District of Pennsylvania, Ar-Tik Systems, Inc., (Ar-Tik) a corporation of [497]*497Indiana, alleged that it entered into an agreement on September 7, 1946 with H. A. McCullough, H. F. McCullough and J. F. McCullough, co-partners doing business as McCullough’s Dairy Queen,1 whereby it licensed the McCulloughs to use and to permit others to use a frozen dessert machine, constructed under its United States Patent 2080971, “within the area comprised by the eastern part of the United States, including the Commonwealth of Pennsylvania, upon payment of a certain consideration based upon the quantities of frozen dessert used and upon certain other considerations more fully enumerated therein”; that under the terms of a series of assignments from the McCulloughs and others there was executed a certain contract dated November 29, 1949, which Ar-Tik averred had been assigned to the defendant Dairy Queen, Inc., a corporation of the State of Washington, registered to do business in the Commonwealth of Pennsylvania, whereby it became entitled to use within the territorial limits of Pennsylvania the trade name “Dairy Queen” in connection with the manufacture and sale of frozen dessert “upon, inter alia, the payment of certain considerations to the plaintiff and the plaintiff’s assignors” under the said agreement of September 7, 1946; that prior to November 29, 1949 the McCulloughs coined and registered the trade name “Dairy Queen” and in conjunction with the plaintiff and others developed it by extensive nation-wide advertising, supervision of manufacture, sale and method of sale of frozen dessert known as “Dairy Queen” so that the trade name was enhanced in value; that as the result of the acquisition by the defendant, Dairy Queen, Inc., of the rights and liabilities under the contract of November 29, 1949 it became obligated to account to Ar-Tik and the McCulloughs by showing the quantity of frozen dessert mix used and to make payments upon the basis thereof and that in violation of its agreement defendant, Dairy Queen, Inc. has failed to account and to make payments to ArTik and has forfeited the right to use the trade name.
Ar-Tik prayed, among other things, for the production of books and records; a money judgment for such sum as might be found to be due; a temporary injunction to be made permanent enjoining the defendant, Dairy Queen, Inc., from doing anything connected with the sale of the frozen dessert product to the public under the trade name “Dairy Queen”; and that the court shall declare that the defendant has violated paragraph 3 of the agreement of November 29, 1949 and paragraph 9 of the agreement of October 18, 1949 and that the said contracts shall be declared null and void as to any rights defendant, Dairy Queen, Inc., may have acquired therein.2
In its answer the defendant, Dairy Queen, Inc., generally denied the allegations of the eompaint. However, it admitted the assignment to it of the agreement of November 29, 1949.
The defendant, Dairy Queen, Inc., further averred in its answer that the agreement of October 18, 1949 “referred to in paragraph 10 of the complaint and any assignments thereof are unenforceable and ineffective” as a result of paragraphs 7 and 12 of the said agreement of October 18, 1949;3 and that defendant, Dairy [498]*498Queen, Inc., is the sole owner and possessor of the trade name “Dairy Queen” within the State of Pennsylvania.
The defendant, Dairy Queen, Inc., also filed a counterclaim for a declaratory judgment that Ar-Tik has no right in the trade name “Dairy Queen” within the State of Pennsylvania. The plaintiff ArTik answered the counterclaim by denying substantially its allegations.
The pleadings tend to sideglance the real issues in the case which were drawn into much sharper focus by the pretrial proceedings and the hearings before the court.
An opinion was filed by the District Court, in which findings of fact and conclusions of law were made and discussed.4 In effect it was held, among other things, that the law of Illinois should govern the [499]*499crucial contract under which Ar-Tik claims in this case and that under that law Ar-Tik had a right to sue as a third party beneficiary.
[500]*500It was further held that the agreement of October 18, 1949 was a franchise agreement or trademark license and not a patent license agreement so that the defense theory of patent misuse raised by the defendant was found to be inapposite.
The trial court also held that the Mc-Culloughs were merely controlling the type of machines used in Dairy Queen’s stores, similar to like control of the mix, the physical characteristics and other standards of the stores; that Ar-Tik’s claim was not “the product of a thinly veiled technique to create a patent monopoly by indirection” and that the four cent figure can not be termed a royalty payment for Ar-Tik’s patent.
Orders were accordingly entered by the court in favor of Ar-Tik and against Dairy Queen, Inc. in the sums of $86,169.-08 and $32,424.99, representing principal and interest due from Dairy Queen, Inc. and dismissing the counterclaim of the latter. As a result this appeal was taken.
Jurisdiction of the court was properly found to be grounded on diversity of citizenship. 28 U.S.C.A. § 1332.
The suit is an incident in the phenomenal development of the merchandising of this frozen dessert or soft ice cream product to the public by literally thousands of individual stores all over the country under practically uniform methods within a period of less than 23 years.5 It had its inception when on July 31,1939 Harry M. Oltz agreed to grant a license to H. A. McCullough to manufacture an ice cream freezer on which Oltz held United States Patent No. 2080971 in 23 states west of the Mississippi River, known as the “Western Agreement”. McCullough was to furnish the mix to make the product and to pay Oltz a royalty of from four cents to one cent per gallon on all the mix furnished to the machines depending upon the number made and put into operation until the expiration of the patent on May 18, 1954, at which the manufac[501]*501taring rights were to end, but he was to be permitted to keep his machines and operate them independently paying the royalty as usual.6
Evidently the parties considered the exploitation of the “Western Agreement” successful and satisfactory to them for on September 7, 1946, Ar-Tik, a corporation which Oltz had formed and to which he had assigned his interests entered into an agreement with H. A. McCullough granting the exclusive right to manufacture, use and sell machines under the same patent in many states east of the Mississippi River including Pennsylvania. The contract, known as the “Eastern Agreement”, was to terminate on May 18, 1954, but if patents for improvements were secured it was to run for the life of the improvements. McCullough agreed to pay Ar-Tik $10,000 in cash and 60 percent of sums received by him by reason of territorial rights he, McCullough, might grant to third parties until $102,000 was paid to Ar-Tik.
Paragraphs 4 and 5 of the agreement read:
“4. All sublicenses granted by Second Party [McCullough] shall contain a provision obligating the sublicensee to pay to Ar-Tik Systems, Incorporated, the sum of Two Cents (.020) per gallon on all mix used in the machines built during said patent number, said royalty to continue during the life of the machines regardless of the expiration of said patent. * * * ”
“5. Copies of all sublieenses granted by Second Party shall be promptly furnished to Ar-Tik Systems, Incorporated. All machines manufactured shall bear a serial number and Ar-Tik Systems, Incorporated, shall be kept informed at all times of the location of all machines manufactured by Second Party or his sublicensees.”
A supplement to the agreement was entered into on February 20, 1953, as of September 7, 1946, by Ar-Tik and H. F. McCullough acting for McCullough’s Dairy Queen, which substituted the following for paragraph 4 of the original agreement:
“4. All sub-contracts issued by Second Party [McCullough’s Dairy Queen] shall contain a provision obligating the sub-contractor, successors, and assigns, to pay to Ar-Tik Systems, Inc., the sum of Four Cents (.040) per gallon on all mix used in machines built under said patent number, said payments to continue during the life of the machines regardless of the expiration of any [502]*502patents. * * * The said payments in amount of Four Cents (.040) per gallon shall be divided equally between the parties hereto and First Party shall remit to the Second Party the amount of Two Cents (.020) per gallon each month as collected from the sub-contractor.”
Subsequently H. A. McCullough assigned his rights under the agreement of September 7, 1946 to a partnership consisting of him, H. F. McCullough and J. F. McCullough, under the name of McCullough’s Dairy Queen.
On October 18, 1949, McCullough’s Dairy Queen entered into an agreement with Burton F. Myers, Robert J. Rydeen, M. E. Montgomery and Howard Dale, trading under the name of Dairy Queen of Pennsylvania. The agreement recited that McCullough’s Dairy Queen had registered the trademark “Dairy Queen” with the State of Pennsylvania; that ArTik was the owner of Patent No. 2080971 on the Freezing and Dispensing Machine; and that “the rights to manufacture, use, sell, and/or Sub-contract to other parties under said Patent were granted to H. A. McCullough.” It provided that McCullough’s Dairy Queen should convey to the four individuals constituting Dairy Queen of Pennsylvania “an exclusive right to develop the certain territory of the State of Pennsylvania for the restricted conduct of Dairy Queen Stores, * * *."7 Among the conditions assumed by Dairy Queen of Pennsylvania was the payment “direct to McCullough’s Dairy Queen * * * of $150,000 in cash” of which $1,000 was payable at once and the balance as follows:
“* * * 50% forthwith of all amounts of sales of franchises or Territorial rights made by Second Party [Dairy Queen of Pennsylvania] under contracts sold by Second Party, and in addition, 50% of the sale value of all said franchise or territorial rights used by Second Party.”
A minimum payment for each year was fixed in the sum of $18,625 until the full balance of $149,000 was liquidated.
In paragraph 8 of said agreement Dairy Queen of Pennsylvania also agreed to:
“Pay direct, or cause to be paid direct, to Ar-Tik Systems, Inc., 1801 NW 17th Avenue, Miami, Florida, the sum of four cents a gallon on all mix used or sold through any and all Dairy Queen Stores and/or said Freezing and Dispensing Machines operated in Pennsylvania by Second Party and/or their Subcontractors, from the beginning of operations hereof, in the nature of a royalty regardless of the expiration of patent on said machines. * * * ”
In addition Dairy Queen of Pennsylvania covenanted to keep records and maintain methods of store operations in conformity with regulations established by McCullough’s Dairy Queen in agreements with Dairy Queen operators then in force in other states.
Dairy Queen of Pennsylvania also specifically agreed as follows:
“7. That the Second Party [Dairy Queen of Pennsylvania] or any others, shall not sell or offer for sale any other frozen or semi-frozen dairy product, use any other type or make of freezer, or sell any of the said machines, move any of the said machines purchased through the First Party outside of the State of Pennsylvania for the purpose of operating them, without first obtaining the written consent and approval of the First Party within ten days, after it is completed and signed.
[503]*503“8. That Second Party shall order through First Party all of said machines needed for said development, at the manufacturers selling price f. o. b. factory. Said prices may vary from time to time dependent upon costs of material and labor. First Party does not guarantee prices, delivery dates, or furnish parts or labor free of charge on the said machines. Second Party shall take up with manufacturer the mat-' ter of any necessary adjustments for unsatisfactory or defective parts of machines. First Party or Second Party shall not be required to assume responsibility for defending Patent Number 2080971, as such defense is an obligation of Ar-Tik Systems, Inc.”
In an agreement entered into on November 29, 1949, Messrs. Myers, Rydeen, Montgomery and Dale, doing business as Dairy Queen of Pennsylvania, conveyed to Edward Thompson and C. D. Martin, Jr., all of their rights under the contract of October 18, 1949, with McCullough’s Dairy Queen and the right to convey all of their interest to a corporation which they might organize subject to:
“(b) Performance by Second Party [Thompson and Martin] of all of the obligations of the First Party [Myers, Rydeen, Montgomery and Dale, doing business as Dairy Queen •of Pennsylvania] under the McCullough Contract.
“(c) Payment by Second Party of all sums due to Ar-Tik Systems, Inc. and to McCullough’s Dairy Queen under the terms of the McCullough •Contract.
“(d) Payment to First Party, on demand, of the sum of 8,000—in cash plus 100 per gallon of liquid mix (or equivalent in powdered mix) processed through all machines for the manufacture of the product known as ‘Dairy Queen’ in the territory covered by the McCullough Contract, payable on or before the 10th day of each month for the previous calendar month, commencing January 10, 1950.”
On December 23, 1949, Messrs. Martin and Thompson made an assignment of all their rights under their agreement of November 29, 1949 to a corporation they had organized under the laws of the State of Washington known as Dairy Queen, Inc., the defendant herein, in consideration whereof it agreed as follows:
“Dairy Queen, Inc. hereby accepts the assignment of said agreement and does hereby assume and undertake all of the obligations and duties imposed upon C. D. Martin, Jr. and Edward Thompson by the terms of said agreement, and in accordance with the terms thereof the said C. D. Martin, Jr. and Edward Thompson * * * shall have no further personal liability under said agreement.”
Dairy Queen, Inc., in turn, executed franchise agreements with nearly 100 storekeepers in the territory it acquired in which it was described as the “owner of the exclusive right and license to the use of Dairy Queen Freezers manufactured under Patent No. 2080971 and the right to the use of the trade name Dairy Queen in the territory * * * in the State of Pennsylvania.” Each franchise holder was granted the right to make and sell a frozen food under the name Dairy Queen. Among other obligations undertaken by the franchise holders was the obligation to pay a stated amount for the franchise in cash or installments and in addition to pay a royalty of 29 cents per gallon on all mix used in the freezers as long as they were in use or operation.
The franchise agreements contained the provision, “It is understood and agreed that Ar-Tik Systems, Inc. own the patent, (No. 2080971). * * *” Each franchise holder also agreed that his records of the conduct of the business, the serial numbers and location of all freezers, and all the mix used and processed by him would be held open [504]*504to the examination and inspection of ArTik among others. These provisions are contained in the forms of franchise agreement in use until the year 1955, but mention of Ar-Tik and Patent No. 2080971 is not found in the form of franchise used in 1955 and thereafter.
Preliminarily we are confronted with the contention of the defendant that the conflict of laws rule of Pennsylvania dictates that, where the contract is executed in one state and is to be performed in another, the law of the place of performance is controlling; that Pennsylvania is the place of performance of the contract in this case and that under the Pennsylvania law applicable to the third party beneficiaries Ar-Tik may not recover since it is neither a donee nor creditor beneficiary and hence Ar-Tik has no standing to sue.
The District Court held that the law of Illinois was applicable and that the plaintiff, as a direct beneficiary, had standing to sue for a breach of the contract of October 18, 1949.
The Restatement, Contracts § 133, defines a creditor beneficiary as follows:
“(1) V/here performance of a promise in a contract will benefit a person other than the promisee, that person is, * * *
* * * * * *
“(b) a creditor beneficiary if no purpose to make a gift appears from the terms of the promise in view of the accompanying circumstances and performances of the promise will satisfy an actual or supposed or asserted duty of the promisee to the beneficiary, or a right of the beneficiary against the promisee which has been barred by the Statute of Limitations or by a discharge in bankruptcy, or which is unenforceable because of the Statute of Frauds.”
The performance of the royalty provisions of paragraph 3 of the contract of October 18, 1949 satisfied “an actual or supposed or asserted duty of the promisee [McCullough] to the beneficiary [Ar-Tik].”
Pennsylvania has adopted Restatement, Contracts § 133. Commonwealth v. Great American Indemnity Co., 312 Pa. 183, 167 A. 793 (1933); McClelland v. New Amsterdam Casualty Co., 322 Pa. 429, 185 A. 198 (1936).
In paragraph 4 of the contract of September 7, 1946, Ar-Tik required McCullough to provide for the payment to-it of a royalty of two cents per gallon of mix used in the patented machines by all1 sublicensees. This amount was increased to four cents by a supplemental contract as heretofore noted. If was to satisfy this duty that McCullough required his assignees to pay Ar-Tik the four cents-royalty. Contrary to the contention of the defendant, it seems clear that Ar-Tik was a creditor beneficiary under the law of Pennsylvania. Burke v. North Huntingdon Twp., 390 Pa. 588, 136 A.2d 310 (1957); Spires v. Hanover Fire Insurance Co., 364 Pa. 52, 70 A.2d 828 (1950). Since the law of Illinois 8 and the law of Pennsylvania are alike in giving Ar-Tik standing to sue on the instant contract it made no difference which law the District Court applied.
Under the agreement of October 18, 1949, Myers et al. acquired from McCullough’s Dairy Queen (1) the right to use the freezer manufactured under United States Patent No. 2080971 and (2) the exclusive right to develop certain parts of Pennsylvania for the operation of Dairy Queen Stores. A separate consideration is provided for each of these rights. As stated before a royalty of four cents payable to Ar-Tik directly was set for the use of the patented freezer and cash and installment payments to McCullough’s Dairy Queen were fixed for the right to develop the territory with the use of the name Dairy Queen.9
[505]*505On November 29, 1949, a little more than a month after they had acquired it, Myers et al. assigned the contract to Thompson and Martin, who, in turn, on December 23, 1949, in less than a month, transferred it to their corporation, the defendant, Dairy Queen, Inc.
Thus, defendant, Dairy Queen, Inc., assumed the obligation to pay directly to Ar-Tik the four cent royalty in the pattern established in the contract between Ar-Tik and McCullough of September 7, 1946. Indeed, Ar-Tik, admittedly not a signatory to the contract of October 18, 1949, bases its present claim as a named third party beneficiary under that contract.
The defendant, Dairy Queen, Inc., continued to pay the four cent royalty directly to Ar-Tik through November 1954, some six months after the expiration of the patent. It then refused to make further payments although the mix continued to be used in the patented freezers in Dairy Queen stores in Pennsylvania by its franchise holders. However, the defendant continued to make payments on account of its separate obligation to the McCulloughs arising under the contract of October 18, 1949. It also continued to make payments to Messrs. Myers et al. as required by the contract of November 29,1949.
The defendant justifies its termination of payments to Ar-Tik on the ground that the provision of the contract of October 18, 1949, requiring payments to Ar-Tik of royalties beyond the expiration date of the patent, is unenforceable because it constitutes a misuse of the patent.
Early cases do not sustain that position. In E. R. Squibb & Sons v. Chemical Foundation, 93 F.2d 475, 477 (2 Cir. 1937) it was said:
“There is a presumption that royalties are not to be paid after the expiration of a patent; if the intention is to have them continue longer, the parties should phrase their contract in language from which such intention may fairly be inferred.”
The Court of Appeals for the Second Circuit cited as authority two earlier cases in that circuit: Sproull v. Pratt & Whitney Co., 108 F. 963 (2 Cir. 1901) and Pressed Steel Car Co. v. Union Pac. R. Co., 270 F. 518 (2 Cir. 1920). It should be noted, however, that in all three eases the suggestions that royalties could be made payable on expired patents were dicta because in each of the three cases it was found that the royalty contract did not provide for such payment. And in Sproull, the earliest of the Second Circuit cases, no authority is cited to support the dictum there stated.10
[506]*506In Walker, Patents, p. 456, (1961 Supp. to Vol. II Deller’s ed.); Ellis Patent Licenses, Sec. 109, p. 128 (3rd ed. Deller, 1958) and 69 C.J.S. Patents § 262, p. 802, there are statements to the effect that an agreement to pay royalties after a patent has expired may be valid and binding.11 The authorities cited are either the Second Circuit or other cases noted heretofore.
In Ar-Tik Systems v. McCullough, 133 F.Supp. 807 (S.D.Ill.1955) the present plaintiff sued the McCulloughs for breach of the “Western Agreement” of July 31, 1939, which they acquired by assignment, calling for royalty payments regardless of the expiration of the patent. The contract upon which suit was brought granted the McCulloughs the right to manufacture, use and sell ice cream freezing and dispensing machines and provided for the payment of royalties on all machines manufactured under the agreement and used in the business developed by the licensee. The royalty was four cents per gallon on all mix processed through the machines. The court without citing any authority held that there was nothing illegal or contrary to public policy in the agreement. The court made no reference to patent misuse in its opinion.12
[507]*507Apparently the first case which questioned the dictum in Squibb is Baker-Cammack Hosiery Mills v. Davis Co., 181 F.2d 550 (4 Cir. 1950). There the court stated:
“The Davis Company in the new offer also eliminated the provision as to the expiration date of the license. 'Theretofore in order to justify its requirement that a license taken by a manufacturer should last until the •expiration of the youngest patent in the group, it had relied upon the rule announced in such a case as E. R. Squibb & Sons v. Chemical Foundation, 2 Cir., 93 F.2d 475, 477, that if the contract between the parties expressly so provides, royalty payments may be collected after the expiration of the patent. Such a provision, however, might easily lend itself to an unreasonable restraint of trade by extending patents beyond their legal limit; but it has been eliminated in the pending case and need no longer be considered.” 181 F.2d at p. 573.
The New York Court of Appeals has also questioned the dictum in Squibb in April Productions v. G. Schirmer, Inc., 308 N.Y. 366, 126 N.E.2d 283, 69 A.L.R.2d 1305 (1955). There the court held that where a licensee had copyrighted a composition in its own name in accordance with the custom in the music publication business and the contract provided for royalties to the licensor, who was "the assignee of the composer, for each copy sold, the payment of royalties was not required after the expiration of the ■copyright. The court said:
“Our reading of the contract in suit—as imposing no obligation to pay royalties after the expiration of the underlying copyrights—is reinforced by an established rule of construction applied in the analogous field of patent royalty agreements. See E. R. Squibb & Sons v. Chemical Foundation, 2 Cir., 93 F.2d 475, 477; Tate v. Lewis, D.C., 127 F.Supp. 105; Dwight & Lloyd Sintering Co. v. American Ore Reclamation Co., D.C., 44 F.Supp. 396. ‘There is a presumption that royalties are not to be paid after the expiration of a patent; if the intention is to have them continue longer, the parties should phrase their contract in language from which such intention may fairly be inferred.’ E. R. Squibb & Sons v. Chemical Foundation, supra, 93 F.2d 475, 477. In point of fact, an agreement to pay royalties on the manufacture of a patented article ‘after the patent expires, whatever the legal device employed,’ may be unenforcible as contrary to public policy. Scott Paper Co. v. Marcalus Mfg. Co., 326 U.S. 249, 256, 66 S.Ct. 101, 104, 90 L.Ed. 47, 51. For our purposes, the same rules should apply to royalty agreements involving copyrighted literary property, inasmuch as both forms of property—patent and copyright—may be enjoyed for only a limited period of time under the United States Constitution, art. 1, § 8, cl. 8.” 126 N.E.2d at p. 287.
Further doubt is cast on the vitality of the rule set forth in Squibb, in Warner-Lambert Pharm. Co. v. John J. Reynolds, Inc., 178 F.Supp. 655 (S.D.N.Y.1959). There a contract calling for the indefinite payment of royalties for the use of a secret drug formula was upheld. The formula, however, was unpatented. In discussing the instant issue the court said:
“Paralleling the concept that the licensing of a patent or copyright [508]*508contracts only for the statutory monopoljr granted in such cases is the concept not so frequently expressed that public policy may require a termination of the obligation to pay when the patent or copyright term is ended. * * * ” 178 F. Supp. at p. 665.
As authority for this statement the court cited Scott Paper Co. v. Marcalus Co., 326 U.S. 249, 66 S.Ct. 101 (1945).
In the Scott Paper case an inventor assigned the patent to his employer. He left that employment to start his own business, where he allegedly produced an infringing device. In a suit brought by his former employer he defended on the ground that the patent he had assigned had been copied from an expired patent. In reply the employer urged that the defendant was estopped to assert the invalidity of the patent because he had assigned it for value.
The Court held that the assignor of a patent was not estopped from denying its validity in the assignee’s action for infringement where the accused device was that of a prior and expired patent since the patent laws precluded the assignor from estopping himself from enjoying rights which it was the policy of the patent laws to free from all restrictions. In stating the rationale for its holding the Court said in words which appear applicable to the instant issue:
“The aim of the patent laws is not only that members of the public shall be free to manufacture the product or employ the process disclosed by the expired patent, but also that the consuming public at large shall receive the benefits of the unrestricted exploitation, by others, of its disclosures. Kellogg Co. v. National Biscuit Co., 305 U.S. 111, 117-120 [59 S.Ct. 109, 83 L.Ed. 73]. If a manufacturer or user could restrict himself, by express contract, or by any action which would give rise to an ‘estoppel’, from using the invention of an expired patent, he would deprive himself and the consuming public of the advantage to be derived from his free use of the disclosures. The public has invested in such free use by the grant of a monopoly to the patentee for a limited time. Hence any attempted reservation or continuation in the patentee or those claiming under him of the patent monopoly, after the patent expires, whatever the legal device employed, runs counter to the policy and purpose of the patent laws. And for the same reason a stranger, such as respondent, Marcalus, cannot, by securing and assigning a patent on the invention of the expired Inman patent, confer on petitioner any right to deprive the public of the benefits of the free use of the invention for which the public has paid by the grant of a limited monopoly.
“By the force of the patent laws not only is the invention of a patent dedicated to the public upon its expiration, but the public thereby becomes entitled to share in the good will which the patentee has built up in the patented article or product through the enjoyment of his patent monopoly. Hence we have held that the patentee may not exclude the public from participating in that good will or secure, to any extent, a continuation of his monopoly by resorting to the trademark law and registering as a trademark any particular descriptive matter appearing in the specifications, drawings or claims of the expired patent, whether or not such matter describes essential elements of the inventions or claims. Kellogg Co. v. National Biscuit Co., supra, 117-120 [59 S.Ct. 109]; Singer Manufacturing Co. v. June Manufacturing Co., 163 U.S. 169, 185 [16 S.Ct. 1002, 41 L.Ed. 118].
“It is thus apparent that the patent laws preclude the patentee of an expired patent and all others including petitioner from recapturing any part of the former patent monopoly; for those laws dedicate to all the public the ideas and inventions em[509]*509bodied in an expired patent. They do not contemplate that anyone by contract or any form of private arrangement may withhold from the public the use of an invention for which the public has paid by its grant of a monopoly and which has been appropriated to the use of all. The rights in the invention are then no longer subject to private barter, sale, or waiver. Cf. Phillips Co. v. Grand Trunk R. Co., 236 U.S. 662 [35 S.Ct. 444, 59 L.Ed. 774]; Midstate Horticultural Co. v. Pennsylvania R. Co., 320 U.S. 356, 361 [64 S.Ct. 128, 88 L.Ed. 96]; Brooklyn [Savings] Bank v. O’Neil, 324 U.S. 697, 704 [65 S.Ct. 895, 89 L.Ed. 1296]. It follows that the patent laws preclude the petitioner assignee from invoking the doctrine of estoppel, as a means of continuing as against respondent, his assignor, the benefit of an expired monopoly, and they preclude the assignor from es-topping himself from enjoying rights which it is the policy of the patent laws to free from all restrictions. For no more than private contract can estoppel be the means of successfully avoiding the requirements of legislation enacted for the protection of a public interest. * * * ” (Emphasis supplied.) 326 U.S. at pp. 255-257, 66 S.Ct. at pp. 104, 105.
This court expressed its views on the present question in American Securit Co. v. Shatterproof Glass Corp., 3 Cir., 268 F.2d 769 (1959). It held invalid a “package” licensing agreement wherein the licensee was obliged to take a license on a group of patents even if only one was wanted, stating:
“We conclude also, and quite apart from all of the foregoing, that Paragraph 8(a) of Securit’s Standard Licensing Agreement which provides that that agreement shall continue ‘in full force and effect to the expiration of the last to expire of any’ of Securit’s patents set out in ‘Schedule A’ constitutes a patent misuse for it extends the payment of royalties of patents under patents which may expire to the expiration date of that patent most recently granted to Securit. * * * ” (Emphasis supplied and footnotes omitted.) 268 F.2d at p. 777.
Oltz, Ar-Tik’s assignor, sought to bind H. A. McCullough directly in the original contract of July 31, 1939, the “Western Agreement”, to the payment of royalties after the expiration of his patent. In its contract with the McCulloughs of September 7, 1946, Ar-Tik required them to obligate themselves and all sub-licensees to pay it a royalty beyond the expiration of its patent.
The McCulloughs dutifully met this requirement by imposing upon their licensees in paragraph 3 of the agreement of October 18, 1949, the obligation of paying Ar-Tik directly the four cents per gallon royalty. As noted before, subsequent assignments sought to carry the same obligation to the defendant. The fact that Ar-Tik was willing to divide its royalties with McCullough makes them no less tribute for the use of the patent license.
There is no evidence in this case to-support any claim that Ar-Tik was vested with any ownership or interest in the trade name Dairy Queen, in Pennsylvania. The name was created by McCullough and has been exploited in Pennsylvania by the defendant, Dairy Queen, Inc., under the title it acquired stemming originally from McCullough. ArTik’s royalty as contracted for by the McCulloughs and their assigns down to the defendant was solely for the use of its patent.
In this view we differ from the District Court in its Findings of Fact, Nos. 6 and 7, supra, and must hold as-clearly erroneous its determination that under the contract of October 18, 1949 the assignees of the McCulloughs obligated themselves to pay Ar-Tik a royalty of four cents per gallon of mix used, as consideration, inter alia, for the grant-to develop the Pennsylvania territory for [510]*510the restricted conduct of the operation of Dairy Queen stores. As stated heretofore a separate consideration is set forth in paragraph 4 of the agreement of October 18, 1949, supra, for this right. The obligation to pay the four cent royalty is found in paragraph 3 of the said agreement and is solely for the use of the patented machines.
After the expiration of Patent No. 2080971 on May 18, 1954, the grant of patent monopoly was spent. An attempt to extend that monopoly by the exaction of royalties thereafter was unenforceable.13 Such action clearly appears to be interdicted by Scott Paper Co. v. Marcalus Co., supra, and American Securit Co. v. Shatterproof Glass Corp., supra.
Dairy Queen, Inc. further contends that there was misuse of the patent in the restrictions contained in paragraph 7 of the agreement of October 18, 1949, between the McCulloughs and Myers, et al., wherein it was provided that neither the latter nor any others shall “use any other type or make of freezer.” It is urged in this connection that the effect of the restriction “was to force the defendant and its sublicensees to use only the patented freezer and thus free [it] * * * from competition with freezers not coming under the patent.” In view of our earlier holding as to the unenforceability of the agreements for royalties after the expiration of the patent it is unnecessary to rule on the issue of further misuse.
Ar-Tik also urges that the defendant “by its own conduct and interpretation of the contract * * * is precluded from raising the defenses here asserted.” It contends that Dairy Queen is estopped from asserting that the royalty to Ar-Tik is tied to a patent, and, so interpreted, is illegal, because it continued to pay the royalty to Ar-Tik from 1950 until November 1954, well after the expiration of the patent. It also urges that its conduct is inconsistent with its present interpretation of its contractual obligation in that it has entered into many sublicenses at substantial profit incorporating the same royalty structure which it now assails including the same type of restrictive covenants and additional ones; and that it has continued to pay its “separate” obligation to the McCulloughs and to its assignors who conveyed nothing more than their rights under the contract of October 18, 1949. Ar-Tik further submits that Dairy Queen, Inc. has taken and continues to take all the benefits of the 1949 contract and has recognized all of its obligations thereunder except the continued duty to Ar-Tik, thereby manifesting by its conduct that it has interpreted the contract as legal and binding and that it may not now contradict itself by asserting that it is illegal and unenforceable.
None of the acts of the defendant, however inconsistent with the position it has taken in this case, can preclude it from asserting the invalidity of the requirement to pay royalties after the expiration of the freezer patent in view of the reasoning and holding in Scott Paper Co. v. Marcalus, supra.
The continued payments by defendant to its assignors and the McCulloughs under its obligations to them only indicates the recognition of its duty to pay for the right to develop the described territory for its operation of Dairy Queen stores.
Ar-Tik further contends that:
“ * * * Defendant is a promis- or in a third party beneficiary contract. It has received the entire consideration for which it made that promise. Whatever transpired in the past between plaintiff and the McCulloughs, whether expressed in terms of motivation, consideration or whatever, which led to the requirement that defendant pay plaintiff is none of defendant’s concern. [511]*511Defendant may not go beyond its own contract.”
In other words, Ar-Tik contends that the defendant may not argue that the contract of September 7, 1946, as supplemented, is illegal or unenforceable. We do not dispute this contention. The defendant does not base its defense of patent misuse on the 1946 contract between Ar-Tik and McCullough. It submits that the provision of the contract of October 18, 1949 between the McCulloughs and Messrs. Myer et al., eventually assigned to defendant, which required it to pay for the use of the freezer beyond the patent expiration date is illegal and unenforceable. Indeed, as Ar-Tik points out in its brief, the defendant agreed at the trial that its defense had nothing to do with the consideration which passed between Ar-Tik and the McCulloughs. The 1946 contract is relevant only in so far as it illuminates the provisions of the agreement of October 18, 1949.
A number of other contentions are raised by Ar-Tik. They were examined and found to have no influence on the result reached herein.
No position was argued by either party as to the disposition of the counterclaim. The question raised by it is, in any event, encompassed by the main issue settled in this case. Therefore, it may stand dismissed.
The orders of the District Court of September 30, 1960 and November 21, 1960 granting judgments in favor of ArTik Systems, Inc. against Dairy Queen, Inc. in the sums of $86,169.08 and $32,-424.99, respectively, will be vacated and the case remanded with instructions to enter judgment in favor of Dairy Queen, Inc.