Patents by Inventor Aleksandr Sorser

Aleksandr Sorser 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).

  • Electrically conductive coatings applied by internally charged electrostatic sprayers
    Patent number: 6689457
    Abstract: The present invention provides compositions comprising a graphite, binder precursor and low polarity solvent that upon hardening form layers of an electrically conductive material. The compositions of the present invention are sprayable by an internally charged electrostatic sprayer.
    Type: Grant
    Filed: October 17, 2001
    Date of Patent: February 10, 2004
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: David C. K. Chang, Monica A. Pickett, Debra Feldman Singer, Aleksandr Sorser, Debra Sue Strickland
  • Polymeric pigment dispersant having an acrylic backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups
    Patent number: 6037414
    Abstract: A polymeric pigment dispersant of a graft polymer having an acrylic polymer backbone and pending from the backbone, polyester side chains, cyclic imide groups and quaternary ammonium groups and the polymer having a calculated number average molecular weight of 8,000-50,000; wherein the graft copolymer is composed of(a) 10-50%, by weight of the of the graft polymer, of an acrylic copolymer backbone having a number average molecular weight of 2500-10,000 which, before reaction, contains 25-75% by weight of polymerized oxirane containing monomers;(b) 20-85%, by weight of the graft polymer, of a polyester copolymer, or mixture of different polyester copolymers, having a number average molecular weight of 500-10,000 which polyester copolymer is carboxylic-acid functional and is attached to the backbone by a reaction of the carboxylic acid functional group with oxirane group of the backbone;(c) 1-16%, by weight of the graft polymer, of cyclic imide groups attached to the backbone by a reaction of the imide group wi
    Type: Grant
    Filed: September 2, 1998
    Date of Patent: March 14, 2000
    Assignee: E. I. du Pont Nemours and Company
    Inventors: John A. Simms, Aleksandr Sorser