AB Dick Co. v. Simplicator Corporation

AUGUSTUS N. HAND, Circuit Judge.

This is the ordinary patent infringement suit. The patent is for an improvement in stencil sheets for reduplication of typewritten matter. A stencil sheet is a sheet adapted to be converted into a stencil for multiplying copies with less equipment than by printing, particularly in machines which position the paper and stencil and apply ink, so that it passes through the apertures in the stencil and reaches the paper.

In the beginning sheets impervious to ink were used to form stencils, and these sheets were cut or perforated, so as to let the ink through the…