Patents by Inventor Joseph Y. C. Chu

Joseph Y. C. Chu 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).

  • Process for preparation of solid phase dispersion of photoconductive materials
    Patent number: 4013530
    Abstract: Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organo-selenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: March 22, 1977
    Assignee: Xerox Corporation
    Inventors: Joseph Y. C. Chu, W. H. H. Gunther
  • Process for preparation of solid phase dispersion of photoconductive materials
    Patent number: 4013529
    Abstract: Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organo-selenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: March 22, 1977
    Assignee: Xerox Corporation
    Inventors: Joseph Y. C. Chu, W. H. H. Gunther
  • Process for preparation of solid phase dispersion of photoconductive materials
    Patent number: 4007100
    Abstract: Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organo-selenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: February 8, 1977
    Assignee: Xerox Corporation
    Inventors: Joseph Y. C. Chu, W. H. H. Gunther
  • Process for preparation of solid phase dispersion of photoconductive materials
    Patent number: 4007101
    Abstract: Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organoselenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: February 8, 1977
    Assignee: Xerox Corporation
    Inventors: Joseph Y. C. Chu, Wolfgang H. H. Gunther
  • Process for preparation of solid phase dispersion of photoconductive materials
    Patent number: 3994791
    Abstract: Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organo-selenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.
    Type: Grant
    Filed: March 26, 1974
    Date of Patent: November 30, 1976
    Assignee: Xerox Corporation
    Inventors: Joseph Y. C. Chu, W. H. H. Gunther
  • Photosensitive film comprising an organopolyselenide and an organomercury compound
    Patent number: 3967964
    Abstract: Polymeric matrices such as poly(vinylchloride) and poly(methylmethacrylate) loaded with mixtures of an organopolyselenide characterized by the formula:R.sub.1 -- (Se).sub.n -- R.sub.2and an organomercury compound characterized by the formula:R.sub.3 --Hg--R.sub.4form the basis for high resolution and contrast microimaging film systems. Irradiation of these films with activating radiation results in dark images in light struck areas and colorless background. The microimaging film is a negative working system with add-on reimaging capability. The images are stable to projection in conventional slide projection systems.
    Type: Grant
    Filed: August 1, 1975
    Date of Patent: July 6, 1976
    Assignee: Xerox Corporation
    Inventors: Dana G. Marsh, Joseph Y. C. Chu