Patents by Inventor Loretta A. Grezzo Page

Loretta A. Grezzo Page 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).

  • AB diblock copolymers as toner particle dispersants for electrostatic liquid developers
    Patent number: 5106717
    Abstract: Electrostatic liquid developer consisting essentially of(A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in a major amount,(B) thermoplastic resin particles having an average by area particle size of less than 10 .mu.m, and coated with (C),(C) an AB diblock copolymer toner particle dispersant as defined, and(D) a nonpolar liquid soluble ionic or zwitterionic compound. Optionally a colorant and charge adjuvant are present. The process of making the electrostatic liquid developer is described. The electrostatic liquid developer is useful in copying, making proofs including digital color proofs, lithographic printing plates, and resists.
    Type: Grant
    Filed: May 2, 1990
    Date of Patent: April 21, 1992
    Assignee: DXImaging
    Inventors: William A. Houle, Loretta A. Grezzo Page
  • 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