ejecting the shell, as described ■ in the 4 Terry’ report, as ‘seemingly identical, certainly the mechanical equivalent’ of Berdan’s device for the same subject, covered by patent 88,436';” and- also understood “that a use of an invention protected by a patent is the use of private property that must' be paid for, and, therefore, an implied contract that has a place in court, and that if the validity of the patent is sustained, and its use by the government is proved to the satisfaction of the court, the inventor must be paid ; ” and “ ‘ with this understanding,’ continued the manufacture of the Springfield gun, containing the disputed ejector and extractor device, after adjournment of the ‘ Terry board,’ with the expectation that if the court sustained a claim by Berdan against the government upon his patent No. 88,436, then the government must pay him for the use of the invention.”
The import of these findings is this: That the officers of the government, charged specially with the duty of superintending the manufacture of muskets, regarded Berdan as the inventor of this extractor-ejector; that the difference between the spiral and flat spring was an immaterial difference; that, therefore, they were using in the Springfield musket Berdan’s invention ; that they used it with his permission as well as that of his assignee, the petitioner, and that they used it with the understanding that the government would pay for such use as for other private property which it might take, and this, although they did not believe themselves to have the authority to agree upon the price.
These facts bring the case clearly within United States v. Palmer, supra, and show that the judgment of the Court of Claims was not founded upon a tort resulting from a mere infringement, but upon a contract to which both parties assented. That no price was agreed upon, or that the officers of the government were not authorized to agree upon a price, is immaterial. No price was fixed in United States v. Palmer, supra, or in United States v. Russell, 13 Wall. 623. The question is whether there was a contract for the use, and not whether all the conditions of the use were provided for in such contract. This is the ordinary rule in respect to the purchase of property or labor.