Gillette Safety Razor Co. v. Triangle Mechanical Laboratories Corp.

L. HAND, Circuit Judge.

This is an appeal from a decree holding valid and infringed claims 1, 3, 4, 5, 8 and 11 of Patent No. 1,948,192, for a method of putting a blue finish upon razor blades as a substitute for blue lacquer. The plaintiff has spent four millions in advertising this color throughout the country and others apparently wished to trade upon the goodwill so created. The patent is primarily intended to fend them off, but the invention also avoids one step in manufacture— polishing--which during the course of a year in the plaintiff’s enormous business saves a not inconsiderable…