MR. CHIEF JUSTICE WAITE delivered the opinion of the court.
Samuel F. Craig, the appellant, on the 2d of February, 1872, filed in the Circuit Court a bill in equity against Jacob Smith and George D. Hale, to enjoin them from using an improved well-tube, for which he claimed to have letters-patent from the United States bearing date June 11, 1867. They answered, attacking the validity of the letters-patent: 1, Because the patented invention had been described in a...
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