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December 1, 1868


ERROR to the Circuit Court for the Western District of Pennsylvania. The eleventh section of the Patent Act of 1836, relating to the assignment of patents, thus enacts: 'Every patent shall be assignable in law either as to the whole interest, or any undivided part thereof, by any instrument in writing, which assignment, and also every grant and conveyance of the exclusive right under any patent to make and use, and to grant to others to make and use the thing patented, within and throughout any specified part of portion of the United States, shall be recorded,' &c., &c. And the fourteenth section, which relates to damages in suits, brought by the owners of patents, for infringement, says: 'And such damages may be recovered by action on the case, in any court of competent jurisdiction, to be brought in the name or names of the person or persons interested, whether as patentees, assignees, or as grantees of the exclusive right within and throughout a specified part of the United States.' This statute being in force, Moore, a patentee, brought suit in the court below, against Marsh, for infringement. Marsh pleaded that after the date of the alleged infringement, he Moore, the patentee, had sold and assigned an undivided half of the patent for the district where the infringement was alleged to have been committed. To this plea, Moore demurred. The court having sustained the demurrer, and judgment being given accordingly, the case was brought here by the patentee on appeal. The general question therefore, was, whether a sale and assignment by a patentee of his patent right is, under the fourteenth section above quoted, a bar to an action by him to recover damages for an infringement committed before such sale and transfer? In other words, whether the words of the statute 'name of the person interested,' meant, as the plea assumed, 'persons interested in the patent at the time when the suit was brought;' or meant, as the declaration assumed, interested at the time when the cause of action accrued. The case was submitted on briefs.

The opinion of the court was delivered by: Mr. Justice Clifford delivered the opinion of the court.

Mr. S. S. Fisher, for the patentee, appellant, argued, that the latter, or interested in the damages, was the plain meaning; that it would be unreasonable and contrary to all analogies of the law, that a simple assignment of a patent-right should carry with it the right to all previous damages, carry with it all the damages which had ever accrued to its former owners in the whole course of the patent's life, and from the date of the letters patent; that back damages were not a matter inherent in, sticking to, and inseparable from the patent, but were a matter which belonged to the owner in his individual right. And this natural view, he considered, was supported by the authority of this court in Dean v. Mason.*fn1

Messrs. Henry Baldwin, Jr., and W. Bakewell, contra, argued, that the words of the fourteenth section of the statute, meant interested in the patent, and not interested in the damages; and that this was manifest––

1. By comparing this fourteenth section with the eleventh section above cited.

2. By the fact that licensees were excluded, though they were frequently the only parties interested in the damages, while the plaintiff in such cases is the party interested as patentee, assignee, or grantee of an exclusive right, and had no interest in the damages.

3. From the decisions (as the learned counsel interpreted them) of this court and of several of the circuit courts.*fn2

An opposite view, they contended, might lead to gross oppression. According to such view, a party who, in mistake as to his rights–and in these nice questions of mechanical principle, innocent mistake might well occur–may have infringed a patent during a number of years, is exposed at the end of the term to as many separate suits for infringement as there have been separate owners of the patent during the time he has been using it; and may have to defend against fifty separate actions brought by as many different plaintiffs for what has been a continuous act of user of the patented machine. Such a hardship could never be intended by Congress, and this court would not put a construction on the act fraught with such oppressive consequences. This argument, ab inconvenienti, was considered a sound one in this court (the counsel argued), in Gayler v. Wilder*fn3 where Taney, C. J. pressed it in behalf of the court, by Mr. Justice Grier, in Blanckard v. Eldridge,*fn4 where speaking of the eleventh section of the act, he says that 'the act of Congress has not subjected even a pirate of the machine to fifty different suits by fifty several assignees, whose several interests might be affected.'

Dean v. Mason, relied on by Mr. Fisher (the counsel argued), did not apply. It was an assignment pendente lite, the moreover of a more license.

Viewed in the light of the admitted facts, the only question in the case is whether the assignment by the plaintiff to a third person of an undivided half of the right, title, and interest secured to him by his letters patent, subsequent to the alleged infringement, but before the commencement of his suit, is a bar to his claim to recover damages for such infringement.

Letters patent were granted to the plaintiff on the 18th of April, 1848, for a certain new and useful improvement in grain drills, in which it is alleged that he is the original and first inventor of the improvement. Original patent was for the term of fourteen years, but it was subsequently extended by the Commissioner of Patents for the term of seven years from and after the expiration of the original term. Alleged defects existed in the original specification, and in consequence thereof, the plaintiff, on the 3d of February, 1863, surrendered the letters patent, and the same were reissued to him in three new patents for separate and distinct parts of the invention for the unexpired portion of the original and extended terms of the patent.

Damages are claimed of the defendants for infringing the reissued letters patent from the day of the reissue to the 24th of February, 1865, as more fully set forth in the declaration.

Pleas to the declaration were subsequently filed by the defendants, and the record shows that they gave due notice of certain special defences which they proposed to offer in evidence under the general issue, in pursuance of the act of Congress in such case made and provided. Before the day for the trial came, however, the parties filed an agreement waiving a jury and submitting the cause to the court, stipulating that the decision of the court should have the same effect as the verdict of a jury. Leave to amend was subsequently granted by the court to both parties.

Purport of the amendment to the declaration was, that the plaintiff was the sole owner of the letters patent for the county of Union, in the State of Pennsylvania, from the date of the reissued letters patent to the 24th of February, 1865, and that the defendants had infringed the same throughout that period, by making and using the invention, and vending the same to others to be used without his license or consent.

Defendants filed another special plea, in which they alleged that the plaintiff, when he commenced his suit, was not the owner of the exclusive right secured in the reissued letters patent within any part of the United States; that in certain States and districts he had parted with all his interest in the patent; and that, on the said 24th of February, he assigned and transferred an undivided half of all the residue of his right, title, and interest in the same, and, therefore, that the plaintiff had no right to bring this action in his own name against the defendants. Plaintiff demurred to the plea, ...

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