Patents by Inventor Adolfo R. Guitierrez

Adolfo R. Guitierrez 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 composition
    Patent number: 5455137
    Abstract: The present invention relates to an improved toner composition comprising an improved particulate silica dispersing agent. The improved particulate silica is non-charging base treated fumed silica which has been treated with a base having a pH of 10 or greater.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: October 3, 1995
    Assignee: International Business Machines Corporation
    Inventors: Arthur F. Diaz, Adolfo R. Guitierrez