Patents by Inventor Nancy Ann Listigovers

Nancy Ann Listigovers 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).

  • Conductive particles containing carbon black and processes for the preparation thereof
    Patent number: 5883176
    Abstract: Conductive polymeric particles can be formed by mixing a monomer, carbon black and a block copolymer, wherein the block copolymer contains an A block that is miscible with said monomer and a B block that anchors to the surface of the carbon black, such as polystyrene or a derivative of polystyrene. A polymerization initiator is added to the mixture and bulk polymerization is effected until about 5 to about 30 weight percent of the monomer has been polymerized. This partially polymerized product is then dispersed in water and further polymerized.
    Type: Grant
    Filed: May 27, 1997
    Date of Patent: March 16, 1999
    Assignee: Xerox Corporation
    Inventors: Paul J. Gerroir, Nancy Ann Listigovers, Michael F. Cunningham, Thomas E. Enright, John A. Creatura
  • Conductive particles containing carbon black and processes for the preparation thereof
    Patent number: 5747577
    Abstract: Conductive polymeric particles can be formed by mixing a monomer, carbon black and a block copolymer, wherein the block copolymer contains an A block that is miscible with said monomer and a B block that anchors to the surface of the carbon black, such as polystyrene or a derivative of polystyrene. A polymerization initiator is added to the mixture and bulk polymerization is effected until about 5 to about 30 weight percent of the monomer has been polymerized. This partially polymerized product is then dispersed in water and further polymerized.
    Type: Grant
    Filed: December 27, 1995
    Date of Patent: May 5, 1998
    Assignee: Xerox Corporation
    Inventors: Paul J. Gerroir, Nancy Ann Listigovers, Michael F. Cunningham, Thomas E. Enright, John A. Creatura