Patents by Inventor Arthur F. Diaz

Arthur F. Diaz 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
  • Ink composition
    Patent number: 5421868
    Abstract: The present invention relates to an ink composition for ink jet printers comprising an amorphous bis amide, a colorant and a solvent.
    Type: Grant
    Filed: December 28, 1993
    Date of Patent: June 6, 1995
    Assignees: International Business Machines Corporation, Lexmark Corporation
    Inventors: Juan Ayalia-Esquilin, Ying-Ying Cheng, Arthur F. Diaz, Paul L. Gendler, Thomas E. Karis
  • Rollers for use in electrophotographic development
    Patent number: 5411778
    Abstract: The present invention relates to a roller for use in electrophotographic development comprising a rigid substrate and a polymeric covering comprising metal 1,3 bis perfluoroalkyl (1,3 dioxopropane) mixed in a polymer.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: May 2, 1995
    Assignees: International Business Machines Corp., Lexmark Corp.
    Inventors: Arthur F. Diaz, Thomas H. Baum
  • Toner composition
    Patent number: 5382491
    Abstract: The present invention relates to an improved toner composition for electrophotography comprising an improved polyaniline charge control agent.
    Type: Grant
    Filed: December 21, 1993
    Date of Patent: January 17, 1995
    Assignee: International Business Machines Corporation
    Inventors: Arthur F. Diaz, Jean M. Guay, My T. Nguyen
  • Toner compositions
    Patent number: 5073469
    Abstract: The present invention relates to toner compositions containing a negative charge-enhancing additive useful for developing latent electrostatic images to visible images.
    Type: Grant
    Filed: August 9, 1990
    Date of Patent: December 17, 1991
    Assignee: Lexmark International, Inc.
    Inventors: Arthur F. Diaz, Daphne L. Wollmann
  • Di- and tricationic negative charge control agents for electrophotographic developers
    Patent number: 4990426
    Abstract: A negative charge control agent in which the cation of the negative charge control agent is a diammonium or triammonium cation has been found to provide improved charging capacity, along with increased resin compatibility when used in toner compositions.
    Type: Grant
    Filed: January 11, 1990
    Date of Patent: February 5, 1991
    Assignee: International Business Machines Corporation
    Inventors: Arthur F. Diaz, Adolfo R. Gutierrez, Dennis R. McKean
  • Coatings for ink jet nozzles
    Patent number: 4643948
    Abstract: An ink jet nozzle plate is coated with a film comprising a partially fluorinated alkyl silane and a perfluorinated alkane.
    Type: Grant
    Filed: March 22, 1985
    Date of Patent: February 17, 1987
    Assignee: International Business Machines Corporation
    Inventors: Arthur F. Diaz, Richard A. Hernandez
  • Electrochromic display device
    Patent number: 4304465
    Abstract: An electrochromic display device has a polymer film on the display electrode. In the writing step the polymer film on the display electrode is oxidized to a colored, non-transparent form. In the erasing step the polymer film is reduced to a neutral transparent form. A film of polyaniline is used in a preferred embodiment. A film of polypyrrole is used in another embodiment.
    Type: Grant
    Filed: October 29, 1979
    Date of Patent: December 8, 1981
    Assignee: International Business Machines Corporation
    Inventor: Arthur F. Diaz