Patents by Inventor Kenneth Derek Henderson

Kenneth Derek Henderson 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).

  • Surfactant-free semi-continuous emulsion polymerization process for making submicron sized particles for carrier coatings
    Patent number: 6399701
    Abstract: Submicron sized particles of poly(methyl methacrylate) are prepared by a surfactant-free semi-continuous emulsion polymerization process that involves (i) preparing an aqueous phase containing a free radical initiator in water by heating and stirring, (ii) preparing a monomer composition containing at least 80% by weight methyl methacrylate and 1 to 10% by weight of a crosslinking agent, (iii) adding the monomer composition to the aqueous phase to initiate emulsion polymerization of the monomer composition, the adding being done at a rate such that from 0.05% to 5% by weight of the total weight of the monomer composition is added per minute, (iv) continuing heating and stirring following completion of the adding of the monomer composition for an amount of time, and (v) drying and recovering the submicron sized particles of poly(methyl methacrylate). The submicron sized particles of poly(methyl methacrylate are used in forming a coating of carrier particles for a two-component developer composition.
    Type: Grant
    Filed: May 15, 2000
    Date of Patent: June 4, 2002
    Assignee: Xerox Corporation
    Inventors: Thomas E. Enright, Anthony James Paine, George Liebermann, Kenneth Derek Henderson, Scott M. Silence, Bernard A. Kelly