Patents by Inventor Maria E. McCall

Maria E. McCall 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).

  • 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