Stephen Johnson Field

“ Whether the infringement for which the verdict and judgment passed consisted in the simple use of fat liquor in the treatment of leather, or in the use of the process specified, does not appear from the record. A recovery for an infringement of one claim of the patent is not of itself conclusive of an infringement of the other claim, and there was no extrinsic evidence offered to remove the uncertainty upon the record: it is left to conjecture what was in fact litigated and determined. ”

“ The action at law was brought in the Circuit Court of the United States for the Northern District of New York, in the ordinary form of such actions for infringement of the privileges secured by a patent. The defendants pleaded the general issue, and set up, by special notice under the act of Congress, the want of novelty in the invention, and its use by the public for more than two years prior to the application for a patent. The plaintiff obtained a verdict for damages, upon which the judgment mentioned was entered ”