Kuhne Identification Systems, Inc. v. United States

The defendant contends that the invention, as defined in plaintiff’s patent, resides in a sequence of steps required for producing substantially invisible fingerprints, footprints, and the like, with a substantially invisible impression-making material, and then chemically developing the invisible impressions, or prints, to render them readable or permanent for record purposes; that none of the claims of the patent specifies or includes in their phraseology, selected to define the patent monopoly, any specific chemical or ingredient, and that the patent is invalid for the reason that each and…