Patents by Inventor Debesh Majumdar

Debesh Majumdar 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).

  • Positively charged toner compositions containing phosphonium charge enhancing additives
    Patent number: 4537848
    Abstract: Disclosed are improved positively charged toner composition comprised of resin particles, pigment particles, and as a charge enhancing additive a phosphonium compound of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, and R.sub.4, are selected from the group consisting of alkyl, aryl, substituted alkyl, and substituted aryl, and A is an anion.
    Type: Grant
    Filed: June 18, 1984
    Date of Patent: August 27, 1985
    Assignee: Xerox Corporation
    Inventors: Raymond A. Yourd, III, Debesh Majumdar, Robert J. Gruber