Patents by Inventor Wilfred Emerson Vail

Wilfred Emerson Vail has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Electrophotographic carrier comprising a coating of a grafted fluoropolymer
    Patent number: 6124069
    Abstract: A carrier composition is provided for electrophotographic development. Core particles are coated with a graft copolymer of a fluoropolymer and methyl methacrylate. The core particles preferably are a material selected from steel, nickel, iron, ferrites, passivated iron, or mixtures or alloys thereof. The fluoropolymer preferably is a polymer selected from chlorotrifluoroethylene, polyvinylidene fluoride, polytrifluoroethylene, polytetrafluoroethylene, copolymers of vinylidene fluoride and hexafluoropropylene, and copolymers of vinylidene fluoride and tetrafluoroethylene. In a preferred carrier composition, the coating consists of two layers. The exterior layer is a graft copolymer made of a fluoropolymer and methyl methacrylate.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: September 26, 2000
    Assignee: Nashua Corporation
    Inventors: Jan Bartus, Wilfred Emerson Vail