Patents by Inventor George W. Vianco, Jr.

George W. Vianco, Jr. 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).

  • Resistive single component developer composition
    Patent number: 4569896
    Abstract: An improved single component magnetic toner composition with a resistivity of from about 10.sup.13 to about 10.sup.16 ohm/cm, at 1,000 volts, and comprised of:(a) first resin particles of a styrene methacrylate copolymer grafted with or containing a low molecular weight wax composition;(b) second resin particles of a styrene, acrylate, acrylonitrile terpolymer;(c) a major amount of magnetite particles; and(d) islands or patches of carbon black particles in an amount of from about 0.1 percent to about 1 percent by weight, contained on the surface of the resin particles.
    Type: Grant
    Filed: October 10, 1984
    Date of Patent: February 11, 1986
    Assignee: Xerox Corporation
    Inventors: Steven R. Perez, Jacques C. Bertrand, Timothy W. Jacobs, Raymond L. Sommers, George W. Vianco, Jr.