he has no claim to any compensation for the profit or advan- ■ tase the party may derive from it. -
The chief and almost only advantage which the defendant derived, from the use of this improvement was on the high seas, and in other places out of the jurisdiction of the United States. * The plea avers that it was placed on-her to fit her for sea. If it had been manufactured on her deck while she was lying in the port of Boston, or if the captain had sold it there,. he would undoubtedly have trespassed upon the rights of the plaintiff, and would have been justly answerable for the profit and advantage he thereby obtained. Eor, by coming in competition with the plaintiff, where the plaintiff was entitled to the exclusive use, he thereby diminished the value of his prop-érty. Justice, therefore, as well as the act of Congress, would require that he should compensate the patentee for the injury he sustained, and the benefit and advantage which he (the defendant) derived from the invention.
But,' so far-as the mere use is concerned, the vessel could hardly be said to use it while she was at anchor in the port, or lay at the wharf. It was certainly of no value to her while she was in the harbor; and the only use made of it, which can be supposed to interfere with the rights of the plaintiff, was in navigating the vessel into and but of the harbor, when she arrived or was’ about to depart, and while she was within the jurisdiction of the United States. How,- it is obvious that the plaintiff, sustained no damage, and the defendant derived no material advantage, from the use of an improvement of this kind by a foreign vessel in a single voyage to the United States, or from occasional voyages in the ordinary pursuits of commerce ; br if any damage is sustained on the one side, or any profit or advantage gained on the other, it is so minute that it is incapable of any appreciable value.
But it seems to be supposed, that .this user of the improvement was,, by legal intendment, a trespass upon the rights of the plaintiff; and that although no real damage was sustained by the plaintiff, and no profit or advantage gained by the defendant, the law presumes a damage, and that the action may be maintained on that ground. In other words, that there is ■a technical damage, in the eye of the law, although none has really been sustained.
This view of the subject, however, presupposes that the patent .laws embrace improvements on foreign ships, lawfully made in their own country, which have been patented here. But that, is the question in controversy. And the court is of Opiiiion that cases of that kind were not in the contemplation of Congress in enacting the patent laws, and cannot, upon any