Patents by Inventor Anna M. Pearson

Anna M. Pearson 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).

  • Wet rub resistant ink compositions
    Patent number: 6309452
    Abstract: A wet rub resistant ink composition comprises, by weight, at least about 15% carrier medium, colorant in an amount of no more than about 20%, and at least about 2% polymeric capsules having central cavities containing water. The composition is substantially free of film-forming resins. The ink composition may be used in combination with other ink compositions having different colors or shades to increase the color gamut of an ink system.
    Type: Grant
    Filed: December 2, 1999
    Date of Patent: October 30, 2001
    Assignee: Lexmark International, Inc.
    Inventors: Bradley L. Beach, Ameeta B. Madhava, Anna M. Pearson, Ajay K. Suthar
  • Ink composition
    Patent number: 5589522
    Abstract: The invention relates to an aqueous ink composition for use in ink jet printers comprising an aqueous carrier, a pigment, and, preferably, a graft polymer having a polyacrylic acid backbone and hydrophobic side chains.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: December 31, 1996
    Assignee: Lexmark International, Inc.
    Inventors: Bradley L. Beach, James F. Feeman, Anna M. Pearson, Jing X. Sun
  • Preparation of amino terminated polyacrylics
    Patent number: 5492977
    Abstract: Amino terminated polyacrylic acids and polyacrylic acrylates are prepared by free radical polymerization of the acid or acrylate monomers with t-Boc-aminoethanethiol as a chain transfer control agent followed by acid removal of the t-Boc group. The acids and their acrylates are precursors to form dispersants and to modify dyes.
    Type: Grant
    Filed: December 21, 1994
    Date of Patent: February 20, 1996
    Assignee: Lexmark International, Inc.
    Inventors: Bradley L. Beach, Anna M. Pearson, Jing X. Sun