WOODS, Circuit Judge,
(after making the foregoing statement.) .There is a material difference between the abandonment of an invention and the abandonment of an application for letters patent thereon by failure to comply with section 4-894 of (he Eevised Statutes. The tirst gives the invention to the public, and, once done, the act is irretrievable; but, besides the power conferred upon the commissioner of patents to relieve an applicant from an abandonment of his application under the statute, an application, which has lapsed, or been rejected or withdrawn, may be renewed or repeated so long, we suppose, as the invention itself has not been abandoned by reason of a two-years public use or otherwise. The sulqect has been considered bv the supreme court quite fully in Planing Mach. Co. v. Keith, 101 U. S. 479, where, after citing Kendall v. Winsor, 21 How. 922, and Shaw v. Cooper, 7 Pet. 292, the court says:
“These were cases, it is true, where the alleged dedication to the public, or abandonment, was before any application for a patent; but it is obvious there may be an abandonment as well after such an application has been made and rejected or withdrawn as before, and evidenced in the same manner. In Adams v. Jones, 1 Fish. Pat. Cas. 527, Mr. Justice Grier said: ‘A man may justly be treated as having abandoned Ins application if it be not prosecuted with reasonable diligence. But involuntary delay, not caused by the laches of the applicant, should not work a forfeiture of his rights.’ The patent law favors meritorious inventors by conditionally conferring upon them for a limited period exclusive rights to their inventions. But it requires them to be vigilant and active in complying with the statutory conditions. It is not unmindful of possibly intervening rights of the public. The invention must not have been In public use or on sale more than two years before the application for a patent is made, and all applications must [192]*192be completed and prepared for examination within two years after the petition is filed, unless it be shown to the satisfaction of the commissioner that the delay was unavoidable. All this shows the intention of congress to require diligence in prosecuting the claims to an exclusive right. An inventor cannot without cause hold his application .pending during a long period of years, leaving the public uncertain whether he intends ever to prosecute it, and keeping the field of his invention closed against other inventors. It is not unfair to him, after his application for a patent has been rejected, and after he has for many years taken no steps to reinstate it, to renew it, or to appeal, that it should be concluded he has acquiesced in the rejection, and abandoned any intention of prosecuting his claim further. Such a conclusion is in accordance with common observation. Especially is this so when, during those years of his .inaction, he saw his invention go into common use, and neither uttered a word of complaint or remonstrance nor was stimulated by it to a fresh attempt to obtain a patent. When, in reliance upon his supine inaction, the public has made use of the result of his ingenuity, and has accommodated its business and its machinery to the improvement, it is not unjust to him to hold that he shall be regarded as having assented to the appropriation, or, in otter words, as having abandoned the invention.”
See, also, U. S. Rifle & Cartridge Co. v. Whitney Arms Co., 118 U. S. 22, 6 Sup. Ct. Rep. 950.
Guided, as we must be, by these decisions, we are not able to find in the present case an abandonment either of the invention or of the application for the patent. The final decision of the patent office was that there had been no such delay in the prosecution of the claim as to work a forfeiture of the application, and, even if we had the power to do it, we are not required to review that decision, because the answer in the case does not raise the question,- — -the abandonment alleged being of the invention, and not of the application for the patent. It is true that the respondents denied any information or belief whether “the letters patent referred to in the bill of complaint were issued in due form of law,” and asked for strict proof of that and of other averments not admitted; but the facts touching the prosecution of the application were matters of record in the patent office, easily accessible if not known already, and, if the respondents proposed to tender an issue of abandonment, it was necessary to do it by averments to that effect, specific and clear enough to be understood. The abandonment of the invention, it has been suggested, is alleged in terms too general and indefinite to be available; but the essential meaning of the allegation is unmistakable, and, there having been no effort in the court below to obtain a more specific statement, the objection made here comes too late. In respect to the merits of the question, it being established <xr.conceded that the application for the patent was kept alive until the letters issued,.it follows, upon the proofs before us, that if there was ever an abandonment of the invention it must have occurred before January 2, 1883, when the application was filed. But there is nothing in the evidence to warrant that conclusion. As tending to show such abandonment, reference is made to Scribner’s own testimony, to the effect that he made the discovery and reduced it to successful form in an experimental lamp more than two years before he applied for a patent; that he dismembered that lamp, and laid away its parts for reference, but never afterwards used them, and did not produce them in evidence; that he has never caused the [193]*193lamp to bo manufactured for sale, but lias put upon the market in large numbers another lamp, which he invented later, and that he made no earnest effort to obtain this patent until he had seen the Sperry lamp. Bui, viewed in the strongest possible light, tiñese things show no purpose to abandon the invention, because, so long as it was not in public use, and no one else had made and procured a, patent for the same discovery, his right to apply for a patent was subject to no res tried.ion. Even if be had forgotten the invention, or laid it aside as worthless,- — abandoned it, — he had the right to take it up again, and to proceed as if he bad then iirst made the discovery. And once the application was filed it became notice to the world of his claims and lights as they should finally be defined by letters patent, and that notice in Oils instance, besides being lawful, was fair and ampie, because one of the experts in the case has testified that “from the dimensions of the drawing” he made a lamp which he found “to operate as described in ilia specification.”
Scribner denies that he had seen the Sperry lamp before Ms own patent was granted; and even if he did acquire earlier knowledge of Sperry’s patent, it was only natural and right, as the quotation from the decision of the supreme court recognizes that he should he stimulated to a fresli attempt to obtain a patent, — it being clear beyond dispute that he was the first discoverer.
There remains the question of infringement.
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WOODS, Circuit Judge,
(after making the foregoing statement.) .There is a material difference between the abandonment of an invention and the abandonment of an application for letters patent thereon by failure to comply with section 4-894 of (he Eevised Statutes. The tirst gives the invention to the public, and, once done, the act is irretrievable; but, besides the power conferred upon the commissioner of patents to relieve an applicant from an abandonment of his application under the statute, an application, which has lapsed, or been rejected or withdrawn, may be renewed or repeated so long, we suppose, as the invention itself has not been abandoned by reason of a two-years public use or otherwise. The sulqect has been considered bv the supreme court quite fully in Planing Mach. Co. v. Keith, 101 U. S. 479, where, after citing Kendall v. Winsor, 21 How. 922, and Shaw v. Cooper, 7 Pet. 292, the court says:
“These were cases, it is true, where the alleged dedication to the public, or abandonment, was before any application for a patent; but it is obvious there may be an abandonment as well after such an application has been made and rejected or withdrawn as before, and evidenced in the same manner. In Adams v. Jones, 1 Fish. Pat. Cas. 527, Mr. Justice Grier said: ‘A man may justly be treated as having abandoned Ins application if it be not prosecuted with reasonable diligence. But involuntary delay, not caused by the laches of the applicant, should not work a forfeiture of his rights.’ The patent law favors meritorious inventors by conditionally conferring upon them for a limited period exclusive rights to their inventions. But it requires them to be vigilant and active in complying with the statutory conditions. It is not unmindful of possibly intervening rights of the public. The invention must not have been In public use or on sale more than two years before the application for a patent is made, and all applications must [192]*192be completed and prepared for examination within two years after the petition is filed, unless it be shown to the satisfaction of the commissioner that the delay was unavoidable. All this shows the intention of congress to require diligence in prosecuting the claims to an exclusive right. An inventor cannot without cause hold his application .pending during a long period of years, leaving the public uncertain whether he intends ever to prosecute it, and keeping the field of his invention closed against other inventors. It is not unfair to him, after his application for a patent has been rejected, and after he has for many years taken no steps to reinstate it, to renew it, or to appeal, that it should be concluded he has acquiesced in the rejection, and abandoned any intention of prosecuting his claim further. Such a conclusion is in accordance with common observation. Especially is this so when, during those years of his .inaction, he saw his invention go into common use, and neither uttered a word of complaint or remonstrance nor was stimulated by it to a fresh attempt to obtain a patent. When, in reliance upon his supine inaction, the public has made use of the result of his ingenuity, and has accommodated its business and its machinery to the improvement, it is not unjust to him to hold that he shall be regarded as having assented to the appropriation, or, in otter words, as having abandoned the invention.”
See, also, U. S. Rifle & Cartridge Co. v. Whitney Arms Co., 118 U. S. 22, 6 Sup. Ct. Rep. 950.
Guided, as we must be, by these decisions, we are not able to find in the present case an abandonment either of the invention or of the application for the patent. The final decision of the patent office was that there had been no such delay in the prosecution of the claim as to work a forfeiture of the application, and, even if we had the power to do it, we are not required to review that decision, because the answer in the case does not raise the question,- — -the abandonment alleged being of the invention, and not of the application for the patent. It is true that the respondents denied any information or belief whether “the letters patent referred to in the bill of complaint were issued in due form of law,” and asked for strict proof of that and of other averments not admitted; but the facts touching the prosecution of the application were matters of record in the patent office, easily accessible if not known already, and, if the respondents proposed to tender an issue of abandonment, it was necessary to do it by averments to that effect, specific and clear enough to be understood. The abandonment of the invention, it has been suggested, is alleged in terms too general and indefinite to be available; but the essential meaning of the allegation is unmistakable, and, there having been no effort in the court below to obtain a more specific statement, the objection made here comes too late. In respect to the merits of the question, it being established <xr.conceded that the application for the patent was kept alive until the letters issued,.it follows, upon the proofs before us, that if there was ever an abandonment of the invention it must have occurred before January 2, 1883, when the application was filed. But there is nothing in the evidence to warrant that conclusion. As tending to show such abandonment, reference is made to Scribner’s own testimony, to the effect that he made the discovery and reduced it to successful form in an experimental lamp more than two years before he applied for a patent; that he dismembered that lamp, and laid away its parts for reference, but never afterwards used them, and did not produce them in evidence; that he has never caused the [193]*193lamp to bo manufactured for sale, but lias put upon the market in large numbers another lamp, which he invented later, and that he made no earnest effort to obtain this patent until he had seen the Sperry lamp. Bui, viewed in the strongest possible light, tiñese things show no purpose to abandon the invention, because, so long as it was not in public use, and no one else had made and procured a, patent for the same discovery, his right to apply for a patent was subject to no res tried.ion. Even if be had forgotten the invention, or laid it aside as worthless,- — abandoned it, — he had the right to take it up again, and to proceed as if he bad then iirst made the discovery. And once the application was filed it became notice to the world of his claims and lights as they should finally be defined by letters patent, and that notice in Oils instance, besides being lawful, was fair and ampie, because one of the experts in the case has testified that “from the dimensions of the drawing” he made a lamp which he found “to operate as described in ilia specification.”
Scribner denies that he had seen the Sperry lamp before Ms own patent was granted; and even if he did acquire earlier knowledge of Sperry’s patent, it was only natural and right, as the quotation from the decision of the supreme court recognizes that he should he stimulated to a fresli attempt to obtain a patent, — it being clear beyond dispute that he was the first discoverer.
There remains the question of infringement. The claims of the patent in suit, it is conceded, may in terms cover the device of the respondents, but, it is insisted, should he construed so as Up include the construction which alone is illustrated in the drawing;,! described in the specification, and x>ointed out as material in this patent and in the inventor’s second patent application; that is,, that construction in which the main-circuit magnet and its amia-i ture are separated mechanically, and the armature lias “a compeu--' sating motion up and down as the strength of the magnet increases, and diminishes;” that, so construed, the device of the defendant does not infringe, because in it the main-circuit magnet and its armature are mechanically connected, and when the magnet is energized, become and remain rigidly connected until the current is turned out of the lamp; making impossible the up-and-down compensating motion incident to the other form of construction. There is the difference of construction stated between the two lamps. In Scribner’s drawing the poles of the lifting magnet, c, are in a horizontal position, while the position of. the armature, n, is vertical. The armature is mounted opon levers, which prevent its coining into actual contact with the poles of its magnet, and for that reason it is said to he not connected mechanically with the magnet. In i he Sperry lamp, the main-circuit magnet or solenoid is carried upon a. movable frame, but in a perpendicular position, with its armature in a horizontal position, and when the current is on the arma In re is lifted into actual contact with Uie magnet, and so remains in cohesion or mechanical connection while the current lasts. In each lamp the frame on which ihe lifting magnet or solenoid is carried is drawn downward by force of the shunt magnet, and so by the reciprocal action of the two magnets, [194]*194one lifting tlie carbon so as to form the arc and being itself drawn down by tbe other so as to shorten the arc, an arc of constant length and a steady light are maintained; that effect being produced, not by the resultant or differential force of the two magnets working in opposition upon the clutch and carbon, but by their independent and nonconflicting action.
To what extent the regulation of the arc in the complainant’s lamp is affected by a compensating movement up and down “of its armature, as the strength of the magnet, c, increases and diminishes,” is a disputed point. In the original specification the fact of such compensating motion was asserted; but in the amended specification, filed December 12, 1889, — the Sperry patent having been issued June 18th, of that year, upon application filed October 22, 1888, — though the first statement was left unchanged, the expression shown in brackets was interpolated, that the “armature, n, is attracted by the main-circuit magnet, and assumes a definite position in relation thereto, which position it holds, no matter Avhat changes may take place in the strength of the shunt magnet.” As a change in the strength of the shunt magnet implies a corresponding but reversed change in the other magnet, this statement seems to be inconsistent with the other, but, being the later and more definite, should be regarded as controlling. Upon this ques tion, Scribner’s testimony was to the effect that within the ordinary limits of variation of current' strength the operation of feeding will be independent of the strength of the current, though a great decrease in current without an abnormal length of arc existing would cause a feeding down of the carbon rod as magnet, e. would be weakened by the change; that the pull upon the armature would be constant so long as the magnetism of the pole pieces of the electro-magnet, c, is constant; that if the pole pieces were magnetized to saturation, a change of current strength would not appreciably vary the pull of the magnet upon the armature; but that if the magnet were not charged to saturation a change of strength in the current would vary the strength of the pull, but not necessarily affect the position of the armature, which is raised by the attraction of the magnet to the position shown in the drawing and held there during immaterial changes of current strength, not in equilibrium, but in a practically fixed relation, though conditions might arise by which a slight movement of parts would be brought about, which, however, would not affect the successful operation of the lamp; that the special utility of the invention is its freedom from complicated and differential features of action in prior lamps; that the special and valuable feature of construction is the mounting of the main-circuit magnet upon a movable frame, which is moved by the magnet in the shunt of the arc, so as to control the feeding of the rod.
On the other hand, Prof. Carhart, teacher of physics at Ann Arbor, has testified that, since the magnetic connection between the armature and poles of the magnet, in the complainant’s lamp, is an elastic one, so long as the armature is not in actual contact with the poles, any weight in a vertical direction brought to bear [195]*195upon the armature must necessarily depress it below the symmetrical position shown in the drawing, and that without change from the construction shown by the drawing the armature, sustaining as it does the weight of the rod and carbon, will have a compensating motion up and down as the strength of its magnet increases and diminishes; that the connection between the magnet and its armature, being through lines of magnetic force,' is elastic, and, since the direction of the pull is nearly horizontal, a vertical force applied to the system must necessarily depress it, the result in the lamp being io produce a compensating motion up and down, according to the varying strength of the magnet; that the position of the armature is one of equilibrium when the lamp is in operation, and can be practically independent of moderate changes in the current only when the size of the magnet, c, is so great as to be out of all proportion to the lamp of which it forms a part. There was other testimony to the same effect.
There is little of the prior art in the record, but enough to show that Scribner wras mistaken in thinking that by his invention be was the first to arrange magnets so as to have independent and not differential action; which latter, as he explains it, means “the differential or opposing action of two separate electromagnets or solenoids, one in the main circuit and the other in the shunt of the arc, upon a common armature or armature lever, the mechanical pull of one being opposed to the pull of the other, to bring about a regulation of the carbon.” The Kellogg patent, No. 229,580, dated July 6, 1880, shows a lamp with separate magnets or solenoids, each acting independently through a clutch or lifting bar of its own, one to raise a,nd the other to draw down the carbon; and, the lifting bars being so arranged that the grip of one is released before that of the other commences, there arises no opposition between the magnets to produce a resultant or differential effect. So, too, in Scribner’s patent, No. 415,57L, issued November 19, 1889, upon an application filed December 31, 1883, there are main-circuit and shunt-circuit magnets, which operate independently and without conflict to move the same carbon rod. But in neither of these patents is the lifting magnet mounted upon a movable frame, which is controlled by the other magnet in a shunt circuit, and in that respect the novelty of the patent in suit is unquestioned. That feature the respondents have appropriated and are using in a structure which is a clear infringement of the patent, unless the horizontal position of the poles of the lifting magnet and the vertical position of its armature are essential features of the invention. These features, as we have seen, are important only with regard to the question of the compensating up-and-down movement of the armature as the strength of the magnet increases and diminishes; and that strength increases and diminishes with the force of the current through the magnet. But the magnetic current itself is not a part of the device any more than is water an element of a water wheel. In the one water is the power and in the other the electric current, and the devices are contrived for the purpose of controlling and [196]*196applying the power. The invention is in the device, which may have one, two, or more functions, one of great and another of trifling worth. It may he supposed to have a function which it has not. The patent is upon the device, and not upon the functions, real or supposed; and if the device is appropriated in its essential features it will be an infringement, notwithstanding some change in the location and relation of parts, whereby a doubtful function of little comparative worth is eliminated. At first Scribner, it is clear, believed the up-and-down compensating movement of the armature in the main circuit, irrespective of the action of the regulating magnet, to be an important feature of his lamp; but before the patent issued, without changing the drawing or modifying the structure of his device in the least, he presented an amended specification, in which he repudiated that idea, and described the armature in operation as assuming and holding a definite relation to the magnet. So long as he did not change the structure of his device or invention, he had the right to change the specification, even though he did it with reference to the Sperry patent, which was applied for and issued while his application was •pending; and, the specification being as we find it, there is no support for the proposition that for the purpose of preserving the possibility of a function, which the patentee had repudiated before : the patent issued, the claims, though worded differently, should be so read as to cover only the exact construction and relation of parts illustrated in the drawing. The proposition is not reasonable, nor, so far as we know, supported by authority.
The first claim of the Sperry patent, and other claims not quoted, are essentially the same as the first and second claims of the patent in suit, and the lamp made by the respondents differs in essential elements from the complainant’s lamp only in respect to .the relative positions of the main-circuit magnet and its armature, horizontal parts being made vertical and vice versa.
Our conclusion, therefore, is that the patent in suit is valid, that it belongs to the complainant as assignee of the patentee, and that the respondents before suit had infringed the first and second claims thereof as charged. The decree below, it follows, must be reversed, and it is so ordered.