Patents by Inventor Dennis G. Madeleine

Dennis G. Madeleine 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).

  • Negative solid block toner
    Patent number: 4925765
    Abstract: Negatively chargeable toner containing block copolymers for electrostatic reprography, giving improved compatibility with the toner resin and higher triboelectric charging. Preferred are block copolymers of styrene, methyl methacrylate and butyl methacrylate as one block and salts or esters of methacrylic acid or acrylic acid as the other block in the copolymer.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: May 15, 1990
    Assignee: E. I. Du Pont de Nemours and Company
    Inventor: Dennis G. Madeleine
  • Positive solid block toner
    Patent number: 4925764
    Abstract: Positively chargeable toner containing block copolymers for electrostatic reprography, giving improved compatibility with the toner resin. Preferred are block copolymers of styrene with methyl methacrylate and butyl methacrylate as one block and dimethylaminoethyl methacrylate as the other block, quaternized with methyl tosylate or benzyl chloride.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: May 15, 1990
    Assignee: E. I. Du Pont de Nemours & Co.
    Inventors: Dennis G. Madeleine, Carol A. Senkler, Loretta A. Grezzo Page