which have accrued to another, and in.which they have no participation. Elizabeth v. Pavement Co., 97 U. S. 126, 138-140; Root v. Railway Co., 105 U. S. 189; Tilghman v. Proctor, 125 U. S. 136, 144-148; Keystone Co. v. Adams, 151 U. S. 139, 147; Coupe v. Royer, 155 U. S. 565, 583.
In the leading case of Elizabeth v. Pavement Co., a suit in equity for the infringement of a patent for an improvement in wooden pavements was brought against a city, as well as against the contractor who had laid down the pavements. It being shown that the city had made no profits from the use of the invention, but that the contractor had, this court héld that profits could be recovered against the contractor only, and not against the city. Mr. Justice Bradley, in delivering judgment, said: One thing may be affirmed with reasonable confidence, that if an infringer of a patent has realized no profit from the use of the invention, he' cannot be' called upon to respond for profits; the patentee, in such case, is left to his remedy for damages.” 97 U. S. 138.
In the case at bar, there was no evidence that the defendants themselves had made any profits whatever from the use of the plaintiff’s invention ; but the only-gains, profits and advantages, upon which the report of the master and the decree of the court were based, were those which had accrued to the United States from the saving in the cost of the gate; and the master found that no damages, in addition to such gains, profits and advantages, had been proved.
The necessary result is that, even if the validity of the patent and its infringement by the defendants- are assumed, the plaintiff, upon this record, is not entitled to an injunction, to profits, or to damages.
The finding of the master, that no damages, in addition to profits, had been proved, does not indeed necessarily imply that the plaintiff had not sustained damages, independent of any profits. But no ground for equitablé relief, by injunction, by account of profits, or otherwise, being shown, the proper, remedy of the plaintiff against the defendants for such damages is by action at law. Elizabeth v. Pavement Co., and Root v. Railway Co., above cited.