Patents by Inventor Koji Okumura

Koji Okumura 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).

  • Patent number: 5950048
    Abstract: An image forming apparatus includes a photosensitive unit and a developing unit, at least one of which is arranged rotatable about a parallel support shaft. In a state that the both units are mounted on an apparatus main body, a developing roller gear (driven gear) of the developing unit is in mesh with a drive gear provided on the photosensitive unit. A drive force is transmitted from the drive gear to the developing roller gear. The developing roller gear and the drive gear are arranged such that a drive force acting on a pitch point has an extension line passing through a center of the parallel support shaft.
    Type: Grant
    Filed: September 17, 1998
    Date of Patent: September 7, 1999
    Assignee: Sanyo Electric Co., Ltd
    Inventors: Koji Okumura, Ryoji Aoki, Masahiko Hayashi, Minoru Kumida, Masami Makino
  • Patent number: 5099296
    Abstract: A thin film transistor in which a source electrode is electrically isolated from a drain electrode and a gate electrode. The gate electrode is formed on one surface of an electrically insulating layer. A semiconducting layer is formed on the other surface of the electrically insulating layer. The semiconducting layer has a charge carrier mobility of at least 1 cm.sup.2 /V-sec. and is made from a polycrystalline diamond layer. The source electrode and the drain electrode are formed on one surface of the polycrystalline diamond layer. The other surface of the polycrystalline diamond layer is in integral contact with the other surface of the electrically insulating layer.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: March 24, 1992
    Assignee: Xerox Corporation
    Inventors: Joseph Mort, Frank Jansen, Mary A. Machonkin, Koji Okumura
  • Patent number: 4737429
    Abstract: An electrostatographic imaging member comprised of a supporting substrate; a hydrogenated amorphous silicon photogenerator layer; and in contact therewith a plasma deposited charge transporting layer with components therein selected from the group consisting of silicon nitrides, boron nitrides, aluminum nitrides, phosphorous nitrides, gallium nitrides, boron phosphides, aluminum phosphides, boron oxides, aluminum oxides, gallium oxides, and organosilanes; and wherein the transporting layer contains therein hydrogen, halides, or mixtures thereof.
    Type: Grant
    Filed: June 26, 1986
    Date of Patent: April 12, 1988
    Assignee: Xerox Corporation
    Inventors: Joseph Mort, Frank Jansen, Koji Okumura, Steven J. Grammatica, Michael A. Morgan
  • Patent number: 4613556
    Abstract: Disclosed is an electrographic imaging member consisting essentially of a supporting substrate, a hydrogenated amorphous silicon photogenerating layer, and in contact therewith a charge transporting layer of plasma deposited silicon oxide containing at least 50 atomic percent of oxygen.
    Type: Grant
    Filed: October 18, 1984
    Date of Patent: September 23, 1986
    Assignee: Xerox Corporation
    Inventors: Joseph Mort, Frank Jansen, Koji Okumura, Steven J. Grammatica, Michael A. Morgan
  • Patent number: 4348473
    Abstract: A dry process for the manufacture of microelectronic devices from a work piece, which may be carried out entirely in a vacuum chamber, and which involves the coating of the work piece with a thin film of a monomer, selectively polymerizing the monomer according to a pattern of the microelectronic device desired, heating the layer of monomer to evaporate unpolymerized monomer to expose electronic circuit materials thereunder, removing the exposed electronic circuit materials, and stripping the polymerized monomer resist from the surface of the work piece.
    Type: Grant
    Filed: March 4, 1981
    Date of Patent: September 7, 1982
    Assignee: Xerox Corporation
    Inventors: Koji Okumura, Franklin D. Saeva
  • Patent number: 4160046
    Abstract: A method of making an imaging system wherein an imaging member comprising a layer of softenable substantially electrically insulating material containing a dispersion of randomly oriented electrically photosensitive orientation particles is imaged by: (A) applying a uniform electric field across said member, (B) imagewise exposing said member to activating electromagnetic radiation, and (C) developing said member by decreasing the resistance of said softenable layer to reorientation of said orientation particles sufficiently to allow imagewise reorientation of said orientation particles, comprising providing an electrically insulating material, adding photosensitive electret particles and forming a layer while applying vibration.
    Type: Grant
    Filed: August 22, 1977
    Date of Patent: July 3, 1979
    Assignee: Xerox Corporation
    Inventor: Koji Okumura
  • Patent number: 4095280
    Abstract: An electrical information or latent image storage system using a storage element which comprises a layer of substantially electrically insulating material having a layer of electrically photosensitive particulate material embedded therein, with a layer of semiconductor material overcoating one surface of the layer of insulating material, and an electrode on the opposite surface of the layer of insulating material. Information in the form of localized electrical charges of an electrical latent image is placed on the element by electrical or photo-electrical means, the information can be retrieved by scanning the element using an electrode-pair grid pattern, an electron beam, or other suitable means, and the retrieved information may be used, for example, through a computer, or reconstructed into a visible image corresponding to a latent image.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: June 13, 1978
    Assignee: Xerox Corporation
    Inventor: Koji Okumura
  • Patent number: 4085455
    Abstract: An electrical information or latent image storage system using a storage element which comprises a layer of substantially electrically insulating material having a layer of electrically photosensitive particulate material embedded therein, with a layer of semiconductor material overcoating one surface of the layer of insulating material, and an electrode on the opposite surface of the layer of insulating material. Information in the form of localized electrical charges of an electrical latent image is placed on the element by electrical or photo-electrical means, the information can be retrieved by scanning the element using an electrode-pair grid pattern, an electron beam, or other suitable means, and the retrieved information may be used, for example, through a computer, or reconstructed into a visible image corresponding to a latent image.
    Type: Grant
    Filed: July 2, 1976
    Date of Patent: April 18, 1978
    Assignee: Xerox Corporation
    Inventor: Koji Okumura
  • Patent number: 4059443
    Abstract: An electrical information or latent image storage system using a storage element which comprises a layer of substantially electrically insulating material having a layer of electrically photosensitive particulate material embedded therein, with a layer of semiconductor material overcoating one surface of the layer of insulating material, and an electrode on the opposite surface of the layer of insulating material. Information in the form of localized electrical charges of an electrical latent image is placed on the element by electrical or photo-electrical means, the information can be retrieved by scanning the element using an electrode-pair grid pattern, an electron beam, or other suitable means, and the retrieved information may be used, for example, through a computer, or reconstructed into a visible image corresponding to a latent image.
    Type: Grant
    Filed: January 9, 1975
    Date of Patent: November 22, 1977
    Assignee: Xerox Corporation
    Inventor: Koji Okumura
  • Patent number: 3972715
    Abstract: An imaging system wherein an imaging member comprising a layer of softenable substantially electrically insulating material containing a dispersion of randomly oriented electrically photosensitive orientation particles is imaged by: (A) applying a uniform electric field across said member, (B) imagewise exposing said member to activating electromagnetic radiation, and (C) developing said member by decreasing the resistance of said softenable layer to reorientation of said orientation particles sufficiently to allow imagewise reorientation of said orientation particles.
    Type: Grant
    Filed: October 29, 1973
    Date of Patent: August 3, 1976
    Assignee: Xerox Corporation
    Inventor: Koji Okumura