Patents by Inventor Cheng K. Hsiao

Cheng K. Hsiao 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).

  • Hydroxygallium phthalocyanine imaging members and processes
    Patent number: 5473064
    Abstract: A process for the preparation of hydroxygallium phthalocyanine which comprises hydrolysis of halogallium phthalocyanine precursor to a hydroxygallium phthalocyanine, and conversion of said resulting hydroxygallium phthalocyanine to Type V hydroxygallium phthalocyanine by contacting said resulting hydroxygallium phthalocyanine with an organic solvent; and wherein said precursor halogallium phthalocyanine is obtained by the reaction of gallium halide with diiminoisoindolene in an organic solvent.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: December 5, 1995
    Assignee: Xerox Corporation
    Inventors: James D. Mayo, James M. Duff, Cheng K. Hsiao, Sandra J. Gardner, Barkev Keoshkerian
  • Hydroxygallium phthalocyanine photoconductive imaging members
    Patent number: 5407766
    Abstract: A process for the preparation of hydroxygallium phthalocyanine and elements containing same which comprises the synthesis of a precursor halogallium phthalocyanine by the reaction of a diiminoisoindolene with gallium acetylacetonate; hydrolysis thereof to hydroxygallium phthalocyanine; and conversion of the resulting hydroxygallium phthalocyanine obtained to Type V hydroxygallium phthalocyanine by contacting said resulting hydroxygallium phthalocyanine with an organic solvent.
    Type: Grant
    Filed: December 20, 1993
    Date of Patent: April 18, 1995
    Assignee: Xerox Corporation
    Inventors: James D. Mayo, James M. Duff, Cheng K. Hsiao, Sandra J. Gardner, Barkev Keoshkerian
  • Processes for the preparation of titanyl phthalocyanines
    Patent number: 5350844
    Abstract: A process for the preparation of a more perfect crystalline form of the Type I polymorph of titanyl phthalocyanine which comprises dissolving a precursor titanyl phthalocyanine Type I in a solution of trihaloacetic acid and alkylene chloride; adding the resultant solution to a solvent thereby enabling precipitation of Type X titanyl phthalocyanine; separating the titanyl phthalocyanine Type X from the solution; followed by a first washing with an organic solvent and a second washing with water; slurrying the resulting Type X titanyl phthalocyanine in an organic solvent enabling conversion of said Type X to Type IV titanyl phthalocyanine; and thereafter, subjecting the Type IV titanyl phthalocyanine obtained to treatment with an organic solvent to enable said crystalline form of titanyl phthalocyanine Type I.
    Type: Grant
    Filed: March 1, 1993
    Date of Patent: September 27, 1994
    Assignee: Xerox Corporation
    Inventors: Trevor I. Martin, James D. Mayo, Nancy A. Listigovers, Cheng K. Hsiao, Terry L. Bluhm, Sharon E. Normandin, Kathleen M. Carmichael
  • Processes for preparation of titanyl phthalocyanines type X
    Patent number: 5206359
    Abstract: A process for the preparation of titanyl phthalocyanine which comprises the treatment of titanyl phthalocyanine Type X with a halobenzene.
    Type: Grant
    Filed: April 11, 1991
    Date of Patent: April 27, 1993
    Assignee: Xerox Corporation
    Inventors: James D. Mayo, James M. Duff, Trevor I. Martin, Terry L. Bluhm, Cheng K. Hsiao, Ah-Mee Hor
  • Titanyl phthalocyanine Type I processes
    Patent number: 5189155
    Abstract: A process for the preparation of titanyl phthalocyanine Type I which comprises the reaction of titanium tetraalkoxide and diminoisoindolene in the presence of a halonaphthalene solvent.
    Type: Grant
    Filed: April 11, 1991
    Date of Patent: February 23, 1993
    Assignee: Xerox Corporation
    Inventors: James D. Mayo, Terry L. Bluhm, Cheng K. Hsiao, Trevor I. Martin, Ah-Mee Hor
  • Processes for the preparation of titaniumphthalocyanine Type X
    Patent number: 5182382
    Abstract: A process for the preparation of titanyl phthalocyanine Type X which comprises dissolving titanyl phthalocyanine Type I in a solution of trifluoroacetic acid and methylene chloride; adding the resultant solution to a solvent enabling precipitation of Type X titanyl phthalocyanine; separating the titanyl phthalocyanine Type X from the solution; followed by a first washing with an organic solvent and a second washing with water; and thereafter a solvent treatment with fluorobenzene.
    Type: Grant
    Filed: May 28, 1991
    Date of Patent: January 26, 1993
    Assignee: Xerox Corporation
    Inventors: James D. Mayo, James M. Duff, Terry L. Bluhm, Cheng K. Hsiao
  • Processes for the preparation of phthalocyanines
    Patent number: 5153313
    Abstract: A process for the preparation of phthalocyanine composites which comprises adding a metal free phthalocyanine, a metal phthalocyanine, a metalloxy phthalocyanine or mixtures thereof to a solution of trifluoroacetic acid and a monohaloalkane; adding to the resulting mixture a titanyl phthalocyanine; adding the resulting solution to a mixture that will enable precipitation of said composite, and recovering the phthalocyanine composite precipitated product.
    Type: Grant
    Filed: June 4, 1990
    Date of Patent: October 6, 1992
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Hai-Yen T. Tran, James M. Duff, James D. Mayo, Gordon K. Hamer, Terry L. Bluhm, Cheng K. Hsiao
  • Perinone photoconductive imaging members
    Patent number: 5139909
    Abstract: A photoconductive imaging member comprised of an unsymmetrical perinone and a charge transport layer.
    Type: Grant
    Filed: July 31, 1990
    Date of Patent: August 18, 1992
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Ah-Mee Hor, Cheng K. Hsiao
  • Processes for the preparation of phthalocyanines imaging member
    Patent number: 5102758
    Abstract: A process for the preparation of phthalocyanine composites which comprises adding a metal free phthalocyanine, a metal phthalocyanine, a metalloxy phthalocyanine or mixtures thereof to a solution of trifluoroacetic acid and a monohaloalkane; adding to the resulting mixture a titanyl phthalocyanine; adding the resulting solution to a mixture that will enable precipitation of said composite, and recovering the phthalocyanine composite precipitated product.
    Type: Grant
    Filed: July 23, 1991
    Date of Patent: April 7, 1992
    Assignee: Xerox Corporation
    Inventors: Peter M. Kazmaier, Hai-Yen T. Tran, James M. Duff, James D. Mayo, Gordon K. Hamer, Terry L. Bluhm, Cheng K. Hsiao
  • Thionated perylene photoconductive imaging members for electrophotography
    Patent number: 4937164
    Abstract: A photoresponsive imaging member comprised of a thionated perylene photogeneratoring layer, and a charge transport layer.
    Type: Grant
    Filed: June 29, 1989
    Date of Patent: June 26, 1990
    Assignee: Xerox Corporation
    Inventors: James M. Duff, Ah M. Hor, Cheng K. Hsiao, Gordon K. Hamer, Rafik O. Loutfy