The company received its first patents more than 60 years ago for the single edge razor blade scraper.
Warner Tool receives patent on color-code technology
April 4, 2004
Warner Tool Products has announced that the United States Patent and Trademark Office agrees and has issued Patent No. 6,668,751 relating to Warner's color-coded technology on ProGrip2 series of putty knives and scrapers. Every ProGrip2 handle has a molded insert that identifies the knife as stiff flex, flex or full flex. A red insert is used for stiff, blue for flex and yellow for full flex.