Arlac Dry Stencil Corp. v. A. B. Dick Co.

WOOLLEY, Circuit Judge.

A. B. Dick Company, assignee of Letters Patent No. 1,536,982, issued to Edward W. Hill, brought this suit for infringement. From an interlocutory decree holding-certain claims valid and infringed, the defendants appealed.

The patent is for a “stencil-sheet” which in its elemental form is a sheet of paper, of typewriter size, so prepared that letters can be cut or impressed upon its surface by the letter-hammers of a typewriter and, when completed,' the stenciled words can be reproduced on a plain sheet placed beneath it by passing an ink roll over the stencil-sheet in…