Patents Examined by Stephen C. Crossan
  • Toner compositions with charge enhancing additives
    Patent number: 4904762
    Abstract: A toner composition comprised of resin, pigment, and a mixture of charge enhancing additives comprised of a first additive of distearyl dimethyl ammonium methyl sulfate, and a second additive comprised of a tetraalkyl ammonium bisulfate.
    Type: Grant
    Filed: August 21, 1989
    Date of Patent: February 27, 1990
    Assignee: Xerox Corporation
    Inventors: Hui Chang, John R. Laing, Maria E. McCall