Patents by Inventor Robert B. Champ

Robert B. Champ 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).

  • Squarylium photoconductors with noncrystalline bisphenol a binders
    Patent number: 5130217
    Abstract: An aggregate xerographic photoconductor having light sensitive squarylium dye and a binder for said dye is chosen from a mixture of bisphenol molecules to form a noncrystalline, nonpolymeric product. A layered photoconductor utilizing this generation layer formulation in conjunction with a hole transporting surface layer is described.
    Type: Grant
    Filed: September 17, 1991
    Date of Patent: July 14, 1992
    Assignee: Lexmark International, Inc.
    Inventors: Robert B. Champ, Donald A. Stremel
  • Organic photoconductors with improved wear
    Patent number: 4889784
    Abstract: An organic photoconductor comprising a charge generation layer and on top thereof a charge transport layer having a higher concentration of charge transport molecules nearer the charge generation layer than in the topmost portion.
    Type: Grant
    Filed: October 25, 1988
    Date of Patent: December 26, 1989
    Assignee: International Business Machines
    Inventors: Robert B. Champ, Meredith D. Shattuck, Donald A. Stremel
  • Squarylium charge generating dye and electrophotographic photoconductor
    Patent number: 4677045
    Abstract: A squarylium dye molecule is synthesized from a phenolic precursor. The resulting hydroxy pyrrolidino squarylium (OHPYRRSQ) dye does not have to be purified in order to provide the dye with a negative response in the Ames test for mutagenicity. A xerographic photoconductor using the molecule shows superior electrophotographic performance.
    Type: Grant
    Filed: May 5, 1986
    Date of Patent: June 30, 1987
    Assignee: International Business Machines Corporation
    Inventors: Robert B. Champ, Robert L. Vollmer
  • Xerographic photoconductors with cross-linked epoxy binder
    Patent number: 4490452
    Abstract: An aggregate-type xerographic photoconductor wherein primary or secondary amines are used not only to solubilize the photoconductor's light sensitive organic dye, but also to act as a cross-linker for an epoxy binder of the bisphenol class. A combined CTL/CGL layer is described, having both hole transport and charge generating dye molecules. The resulting layer is useful either as single-layer, bimodal photoconductor, or as the CGL of a two-layer photoconductor.
    Type: Grant
    Filed: December 9, 1983
    Date of Patent: December 25, 1984
    Assignee: International Business Machines Corporation
    Inventors: Robert B. Champ, Yau T. Chen
  • Hydrazone and pyrazoline or acetosol yellow containing charge transport layer, photoconductor and electrophotographic process using the same
    Patent number: 4362798
    Abstract: A process for electrophotographic reproduction, and a layered electrophotographic plate having a conventional charge generation layer and a p-type hydrazone containing charge transport layer, in which the surface of the charge transport layer is selectively discharged by actinic radiation as a result of the migration through the transport layer of charges generated in the charge generation layer as a result of the actinic radiation and injected into the transport layer, the hydrazone having the composition p-diethylaminobenzaldehyde-(diphenylhydrazone), i.e., ##STR1## and the charge transport layer including DEASP or Acetosol Yellow in an amount not exceeding 13 wt. % of the hydrazone.
    Type: Grant
    Filed: May 18, 1981
    Date of Patent: December 7, 1982
    Assignee: International Business Machines Corporation
    Inventors: Howard W. Anderson, Robert B. Champ
  • Layered electrophotographic plate having tetramethyl benzidene based disazo dye
    Patent number: 4307167
    Abstract: A layered electrophotographic plate having a triaryl pyrazoline containing charge transport layer and a charge generation layer having a photogenerating dye of the composition: ##STR1##
    Type: Grant
    Filed: March 3, 1980
    Date of Patent: December 22, 1981
    Assignee: International Business Machines Corporation
    Inventors: Larry D. Bowden, Robert B. Champ, Michael T. Moore