Horace Gray

“ The specification and the claim of that reissue, as clearly appears upon its face, both treated the notch in the flange of the bushing as an essential element of the invention. Of the notch in that reissue it may be said-as this court, in a case decided at October term, 1877, said of the notch described in the reissue for the wrench-that it was 'vital in the invention covered by his patent. The notch is the point of engagement between the bushing and the wrench when the latter, operating as a lever, gives the former its circular motion, and thus forces it home. ”

“ This was a bill in equity for the infringement of a second reissue of letters patent. When the facts are understood, the case is clear. The original patent, issued August 29, 1871, No. 118,517, was for an 'improvement in metallic bushings for the bungs of casks, etc., and in wrenches for operating the same;' and described the bushing thus: 'A tapering thimble or ring of metal, provided with a flange, b, at its larger end, and having a screwthread,c, on its outer surface, which screw-thread is cast on the bushing in the mould, and is capable of immediate use without other finishing. ”