Williams, Ch. J.
The defendant claims, that patents are exclusively within the jurisdiction of the courts of the United States; and therefore, this court will not take jurisdiction of this case. That the validity of patent rights, is a subject peculiarly within the jurisdiction of the courts of the United States, is true. But it is equally true, that when they come in question collaterally, their validity must become a subject of inquiry in the state courts. Thus, in a suit upon a note, if it is claimed that the note was given for a patent right, and the patent is invalid, and so there was no consideration for the note, the state courts constantly exercise jurisdiction. Bliss v. Negus, 8 Mass. R. 46. Cross v. Huntly, 13 Wend. 385. But if the plaintiffs are right in their claim, in the present case, the validity of the patent cannot come in question at all. We do not see, therefore, but that before any question of jurisdiction can arise, we are bound to determine whether the evidence offered by the defendant, is admissible or not. The [415]*415plaintiffs say, that the validity of the patent cannot be made a question, by this defendant; for he, by his covenants, and accepting a license from the plaintiffs, is estopped from denying their title to this patent, and the validity of the patent itself; and therefore, the testimony offered by the defendant must all be excluded. They say, that the recitals in this instrument, conclude the party as entirely as any covenant. The general rule upon this subject, is fully established. Shelly v. Wright, Willes, 9. Carver v. Jackson, 4 Pet. 82. Stow v. Wyse, 7 Conn. R. 214. On the other hand, it is claimed, that there is nothing which will prevent the defendant from showing, that there is no consideration for this agreement; and that it is not, therefore, to be regarded in a court of law. And that such is the doctrine of the English courts, even at law, was settled in the case of Hayne v. Maltby, 3 Term R. 438. We do not feel called upon to say, how a court of law would treat this instrument. This is an application to a court of equity, to interpose its assistance in favour of the party claiming under this specific instrument, and merely by virtue of it. The defendant admits the execution of the writing, signed and sealed by him; but claims to prove, that it was done under these circumstances: that he had been informed by Woodworth, that he had a valid patent, but that the machine was the invention of one Emmons, who had procured a patent therefor, then subsisting, and supposed to be valid, the right to which was conferred on the assignees of said Woodworth. He further claimed, that the plaintiffs drew the writing in question, and presented it for his signature; and under these circumstances, he executed it.
The question then arises, whether these facts can be given in evidence, upon this application, to show that the party ought not to be concluded by this admission. In Jackson d. Brown & al. v. Ayres, it was said, that a similar agreement was conclusive upon the party, unless he had been deceived or imposed upon. 14 Johns. R. 224. In Jackson d. Shaw v. Spear, the court charged the jury, that if Spear had acknowledged Winter’s title, and had made a positive agreement to purchase, with a full knowledge of his rights, and had made no mistake in this respect, he and those holding under him were estopped from denying Winter’s title; but if they should believe, that Spear acted under a mistake, at the time [416]*416he made such agreement, he was not concluded; and although this decision was reversed in the supreme court, the law upon this point was recognized by that court, who held, that it was. unreasonable to preclude a defendant from showing that the plaintiff had no title, if the acknowledgment of his title was produced by imposition, or made under a misapprehension of the rights of the respective parties. 7 Wend. 401.
And in an earlier case in the same state, where the defendant, in a letter, had acknowledged the plaintiff’s title, and offered to purchase of him, the court said, that he was not precluded from showing that he grounded his letter on a mistake, or that the fee existed in himself. Jackson d. Viely and Clark v. Cuerden, 2 Johns. Ca. 353.
Such have been the decisions in the state of New-York, even by courts of law; but however these decisions might be regarded, by our courts of law, they are peculiarly appropriate to courts of chancery, more especially as they have been recognized, by that distinguished judge, whose opinions have shed so much light upon the path of his successors. When speaking of the effect of a recital in a deed, in the case of Stoughton v. Lynch, Chancellor Kent says: “I am satisfied that the recital is not only not true in point of fact, but that its insertion arose from misapprehension and mistake, and was not distinctly understood or knowingly assented to, by the plaintiff, at the time he executed the deed. It would then be very inequitable, and contrary to the policy of this court, which has ample jurisdiction over the correction of mistakes in the most solemn instruments, to permit a recital, originating in mistake, and untrue in fact, to be now set up, as a technical bar to the admission of the truth. There can be no doubt that the mistake contained in that recital, might be corrected, on a bill filed for that purpose; and it would be very unfortunate, and deeply to be regretted, if in the mean time, with satisfactory proof of the mistake, we were bound to give force to it, on a question of evidence merely, under the notion of its being a dry forbidding estoppel. I am not disposed to push the common law doctrine of estoppel to such a rigorous extent.” 2 Johns. Ch. R. 222. The facts of that case are not particularly given; but from the remarks of the chancellor, they would seem to correspond very nearly with the facts in the case before us; and the views expressed are so consonant [417]*417to the principles of justice, as to commend themselves to the approbation of those courts, which are not bound by the decision itself.
It is said indeed, in this case, that this was a settlement of an existing claim, by parties competent to make it, upon their own terms. There was no other evidence of a settlement than what the instrument itself imports; and if that is to be so intended, yet a settlement, as well as a covenant, might be set aside, in a court of chancery, if founded upon a mistake. If the defendant proves, what he claims he can prove, it is very evident, that there was a great mistake of both parties, or gross fraud on the part of the plaintiffs, because this recital is the declaration of the plaintiffs, as much as of the defendant. The plaintiffs thus assert, that they are the sole owners of Woodworth's patent, and the defendant, believing it, acknowledges he has no right, and takes a lease from them. He now says, he can prove that Woodworth had no right, and the plaintiffs have derived no right from him. If this is so, ought a court of chancery to exclude the evidence, and allow the plaintiffs to shield themselves in this way?
It is claimed, however, that the defendant, after exhausting the benefit of this contract, shall not be at liberty now to reject it, or say that it is void.
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Williams, Ch. J.
The defendant claims, that patents are exclusively within the jurisdiction of the courts of the United States; and therefore, this court will not take jurisdiction of this case. That the validity of patent rights, is a subject peculiarly within the jurisdiction of the courts of the United States, is true. But it is equally true, that when they come in question collaterally, their validity must become a subject of inquiry in the state courts. Thus, in a suit upon a note, if it is claimed that the note was given for a patent right, and the patent is invalid, and so there was no consideration for the note, the state courts constantly exercise jurisdiction. Bliss v. Negus, 8 Mass. R. 46. Cross v. Huntly, 13 Wend. 385. But if the plaintiffs are right in their claim, in the present case, the validity of the patent cannot come in question at all. We do not see, therefore, but that before any question of jurisdiction can arise, we are bound to determine whether the evidence offered by the defendant, is admissible or not. The [415]*415plaintiffs say, that the validity of the patent cannot be made a question, by this defendant; for he, by his covenants, and accepting a license from the plaintiffs, is estopped from denying their title to this patent, and the validity of the patent itself; and therefore, the testimony offered by the defendant must all be excluded. They say, that the recitals in this instrument, conclude the party as entirely as any covenant. The general rule upon this subject, is fully established. Shelly v. Wright, Willes, 9. Carver v. Jackson, 4 Pet. 82. Stow v. Wyse, 7 Conn. R. 214. On the other hand, it is claimed, that there is nothing which will prevent the defendant from showing, that there is no consideration for this agreement; and that it is not, therefore, to be regarded in a court of law. And that such is the doctrine of the English courts, even at law, was settled in the case of Hayne v. Maltby, 3 Term R. 438. We do not feel called upon to say, how a court of law would treat this instrument. This is an application to a court of equity, to interpose its assistance in favour of the party claiming under this specific instrument, and merely by virtue of it. The defendant admits the execution of the writing, signed and sealed by him; but claims to prove, that it was done under these circumstances: that he had been informed by Woodworth, that he had a valid patent, but that the machine was the invention of one Emmons, who had procured a patent therefor, then subsisting, and supposed to be valid, the right to which was conferred on the assignees of said Woodworth. He further claimed, that the plaintiffs drew the writing in question, and presented it for his signature; and under these circumstances, he executed it.
The question then arises, whether these facts can be given in evidence, upon this application, to show that the party ought not to be concluded by this admission. In Jackson d. Brown & al. v. Ayres, it was said, that a similar agreement was conclusive upon the party, unless he had been deceived or imposed upon. 14 Johns. R. 224. In Jackson d. Shaw v. Spear, the court charged the jury, that if Spear had acknowledged Winter’s title, and had made a positive agreement to purchase, with a full knowledge of his rights, and had made no mistake in this respect, he and those holding under him were estopped from denying Winter’s title; but if they should believe, that Spear acted under a mistake, at the time [416]*416he made such agreement, he was not concluded; and although this decision was reversed in the supreme court, the law upon this point was recognized by that court, who held, that it was. unreasonable to preclude a defendant from showing that the plaintiff had no title, if the acknowledgment of his title was produced by imposition, or made under a misapprehension of the rights of the respective parties. 7 Wend. 401.
And in an earlier case in the same state, where the defendant, in a letter, had acknowledged the plaintiff’s title, and offered to purchase of him, the court said, that he was not precluded from showing that he grounded his letter on a mistake, or that the fee existed in himself. Jackson d. Viely and Clark v. Cuerden, 2 Johns. Ca. 353.
Such have been the decisions in the state of New-York, even by courts of law; but however these decisions might be regarded, by our courts of law, they are peculiarly appropriate to courts of chancery, more especially as they have been recognized, by that distinguished judge, whose opinions have shed so much light upon the path of his successors. When speaking of the effect of a recital in a deed, in the case of Stoughton v. Lynch, Chancellor Kent says: “I am satisfied that the recital is not only not true in point of fact, but that its insertion arose from misapprehension and mistake, and was not distinctly understood or knowingly assented to, by the plaintiff, at the time he executed the deed. It would then be very inequitable, and contrary to the policy of this court, which has ample jurisdiction over the correction of mistakes in the most solemn instruments, to permit a recital, originating in mistake, and untrue in fact, to be now set up, as a technical bar to the admission of the truth. There can be no doubt that the mistake contained in that recital, might be corrected, on a bill filed for that purpose; and it would be very unfortunate, and deeply to be regretted, if in the mean time, with satisfactory proof of the mistake, we were bound to give force to it, on a question of evidence merely, under the notion of its being a dry forbidding estoppel. I am not disposed to push the common law doctrine of estoppel to such a rigorous extent.” 2 Johns. Ch. R. 222. The facts of that case are not particularly given; but from the remarks of the chancellor, they would seem to correspond very nearly with the facts in the case before us; and the views expressed are so consonant [417]*417to the principles of justice, as to commend themselves to the approbation of those courts, which are not bound by the decision itself.
It is said indeed, in this case, that this was a settlement of an existing claim, by parties competent to make it, upon their own terms. There was no other evidence of a settlement than what the instrument itself imports; and if that is to be so intended, yet a settlement, as well as a covenant, might be set aside, in a court of chancery, if founded upon a mistake. If the defendant proves, what he claims he can prove, it is very evident, that there was a great mistake of both parties, or gross fraud on the part of the plaintiffs, because this recital is the declaration of the plaintiffs, as much as of the defendant. The plaintiffs thus assert, that they are the sole owners of Woodworth's patent, and the defendant, believing it, acknowledges he has no right, and takes a lease from them. He now says, he can prove that Woodworth had no right, and the plaintiffs have derived no right from him. If this is so, ought a court of chancery to exclude the evidence, and allow the plaintiffs to shield themselves in this way?
It is claimed, however, that the defendant, after exhausting the benefit of this contract, shall not be at liberty now to reject it, or say that it is void. If it appeared, that the defendant had been enjoying benefit under it, and the plaintiffs been deprived of rights by it, the aspect of the case would be greatly altered. Wallis v. Truesdale, 6 Pick. 457. But what have the plaintiffs lost? The bill charges, they have been erecting machines and buildings to carry on the business more extensively, which have in some measure become useless; of which, however, there was no proof. They have given nothing but the right to use, for a few days, a machine, which the defendant offers to show, he had a right to use before, and to delay, for a few days, a suit against the defendant, which it is not shown they ever intended to commence. On the other hand, the defendant has gained nothing, except perhaps the delay of a suit some twenty days; which suit, if he is right, must have been utterly vain. This consideration cannot, therefore, change the aspect of the plaintiffs’ case.
But there is another part of the evidence, which, we think, is admissible.
The recital in the deed, and the acceptance of a license [418]*418under Woodworth’s patent, equally import a recognition of the plaintiffs’ right; but they do not fix the time of the continuance of that right.
The defendant takes his license only until the 27th of December. By the license, therefore, he acknowledges a right in the plaintiffs only to that time; and unless the terms of the instrument require a different construction, it would seem fair to suppose, that the termination of the acknowledged right, was limited, by the termination of the time of the license. But here the plaintiffs claim, that the proviso amounts to a covenant by the defendant, on his part, not to run his machine after the 27th of December, during the existence of Woodworth’s patent.
That a proviso may be a qualification of the covenant of one party, or a covenant by the other, is certainly true; because in indentures, “the law makes each party privy to the speech of the other, and will make such reference thereof as is most fit and reasonable, and will say the words are spoken by him, who could most properly speak them.” Plowd. C. 134. Or, in the language of more modern cases, covenants shall be construed according to the true intent and meaning of the parties. We are then to inquire, what was the true intent of these parties? The defendant, having conceded an existing right in the plaintiffs, and negatived any right in himself, consents to take a license from the plaintiffs until the 27th of December; and after granting that license, the plaintiffs covenant, that they will not commence or prosecute any suit at law against him, for damages for a previous infringement of that right; provided the defendant shall not, after said 27th of December, infringe their patent, during its continuance. When a party claims to establish his right, merely by estoppel, the instrument by which the estoppel is supported, should be precise, dear and unequivocal, not depending upon doubtful inference. The taking a license, for a time, of a right, which, it is agreed, must be temporary in the plaintiffs, could hardly be considered as an acknowledgment of a right in the plaintiffs beyond the termination of the license; and it would seem, that if the party intended to acknowledge the right to extend beyond the expiration of the time he had taken [419]*419license under it, he would be as explicit as in the acknowledgment of the right itself.
The acceptance of a lease for a certain term, and entering into possession under it, is, says Judge Bristol, as much a recognition of title, as though made by the most solemn instrument. 3 Conn. R. 47. And yet, it has been holden, that the estoppel continued only during the continuance of the occupation. 3 Term R. 441. Why then should this estoppel continue beyond the expiration of the license?
The proviso, it is said, requires such a construction. There has been much nice discussion upon the word “provided.” 2 Co. 72. Cro. Eliz. 242. 385. 486. 560. Cro. Car. 128. It is certain, as is said by Judge Swift, that there is no word more proper to express a condition than this word “provided;" and it shall always be so taken, unless it appears from the context to be the intent of the parties that it shall constitute a covenant. 4 Day, 326. Where then is that intent, in the case before us? Not in the license; for that expired on the 27th of December. Not in the recital; for that is only that the plaintiffs are the sole owners.
In the proviso it does appear, that the plaintiffs covenant not to institute or continue suits against the defendant for causes of action already accrued; provided the defendant shall not run his machine after the 27th of December, until the expiration of Woodworth’s patent. This is evidence that the plaintiffs intended a further restraint upon the defendant after the 27th of December, to be enforced, by the fear of prosecution for the past. This is the penalty to which the defendant assents; and we can discover no further assent on his part. If he violates this rule, which the plaintiffs have prescribed, he incurs the penalty; but we can see no reason to say he submits to any thing more.
Let us look a little closer at this instrument. After the plaintiffs have set out their right to this patent, and the defendant has negatived any right in himself, the defendant, in consideration of a right to run the plaintiffs’ machine three days in a week, grants to the plaintiffs a right to use Thompson's machine; and they, in consideration of the above, grant to him a right to run their patent three days in a week until the 27th of December, and add, “we further agree not to institute or pursue any action at law against him for damages, [420]*420for his having infringed heretofore our right to Woodworth’s patent, &c. provided the said 1. Atwater shall not, either himself or his assigns, or any one under him, run his machine after the 27th day of December, or by any other machine, infringe the said Woodworth’s patent, during its continuance.”
The language purports to be the language of the plaintiffs, not of the defendant. It does not seem to imply any personal obligations upon him, but merely to qualify the extent of the plaintiffs’ obligations.
Before this, the defendant has clearly acknowledged no right in the plaintiffs after the 27th of December; and to imply such an acknowledgment from this proviso, introduced, as it seems, by the plaintiffs, to limit their own covenants, and to this add, that the party is estopped from showing the real truth, would, in our opinion, be contrary to the rule that covenants are to be construed according to the intent of the parties, and carrying what Judge Kent calls a dry estoppel, further than any case within our knowledge.
Without, therefore, going into all the questions discussed in this case, the court are of opinion, that the evidence offered by the defendant, was admissible; and as the inquiry is also made what decree should be passed, we infer that the evidence, if admitted, would prove the facts offered to be proved.
We therefore advise the superior court, that the evidence should be admitted, and the bill dismissed.
In this opinion the other Judges concurred.
Bill dismissed.