Patents by Inventor Yasuo Hirano

Yasuo Hirano 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).

  • Member for developing electrostatic latent images
    Patent number: 4958193
    Abstract: A member for developing electrostatic latent images to visible images of a support having a first coating layer of an elastic material formed on the support, and a second coating layer of a flexible resin formed on the first coating layer, both coating layers having a volume resistivity of 10.sup.6 -10.sup.11 .OMEGA..cm. Such member is used in an apparatus in conjunction with a developer holding device, a developer supplying system, and a developer regulating element for regulating the thickness of the developer.
    Type: Grant
    Filed: June 12, 1989
    Date of Patent: September 18, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazuo Nojima, Yasuo Hirano
  • Developing apparatus
    Patent number: 4833058
    Abstract: This invention relates to a developing apparatus for one component type toner, which has a thin film-forming element applying a thin film of one component type toner on the surface of a toner holder, characterized in that said thin film-forming element is composed of a silicone rubber comprising 100 parts by weight of a siloxane polymer having a cross linking density of 4-8.times.10.sup.-4 mol/cc and 30-70 parts by weight of silica.
    Type: Grant
    Filed: September 17, 1987
    Date of Patent: May 23, 1989
    Assignee: Ricoh Co., Ltd.
    Inventors: Yasuo Hirano, Kazuo Nojima, Motoi Orihara
  • Fixing roll
    Patent number: 4702964
    Abstract: A fixing roll characterized by crosslinking its surface with a rubber compound consisting essentially of a methyl vinyl system silicone raw rubber and silica and forming thereon a silicone rubber layer having a crosslinking density of 1.times.10.sup.-4 .about.8.times.10.sup.-4.
    Type: Grant
    Filed: July 12, 1985
    Date of Patent: October 27, 1987
    Assignee: Ricoh Co., Ltd.
    Inventors: Yasuo Hirano, Kazuo Nojima
  • Copolymerization of lactam with diene polymer having amino or imino end groups
    Patent number: 4691004
    Abstract: A process for producing a lactam copolymer, which comprises copolymerizing an omega-lactam and a diene polymer having an amino or imino group at molecular ends by the action of an alkaline catalyst and a polyfunctional co-catalyst, the proportions of the components satisfying the following equations (I) and (II)a/c>1/4 (I)b/c>1 (II)wherein a, b and c represent the equivalent weights of the alkaline catalyst, the polyfunctional co-catalyst and the diene polymer, respectively, per equivalent of omega-lactam.
    Type: Grant
    Filed: October 22, 1985
    Date of Patent: September 1, 1987
    Assignee: Allied Corporation
    Inventors: Masao Nishiyama, Yasuo Hirano
  • Fixing roll
    Patent number: 4603087
    Abstract: A fixing roll which comprises crosslinking a rubber compound containing a methyl vinyl system silicone raw rubber and silica so as to have a crosslinking density of 6.times.10.sup.-4 mole/cc and forming a coated layer.
    Type: Grant
    Filed: November 9, 1984
    Date of Patent: July 29, 1986
    Assignee: Ricoh Co., Ltd.
    Inventors: Hideaki Ema, Yasuo Hirano, Kazuo Nojima