Patents by Inventor Hideki Akiyoshi

Hideki Akiyoshi 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).

  • Electrophotographic photoconductor having cylindrical base support of specific phenol resin
    Patent number: 4837120
    Abstract: An improved electrophotographic photoconductor is disclosed, which comprises a cylindrical electroconductive support and a photoconductive layer formed on the electroconductive support, which electroconductive support comprises a base support made of a phenol resin with the releasing rate of ammonia therefrom per 48 hours being 50 ppm or less.
    Type: Grant
    Filed: November 19, 1987
    Date of Patent: June 6, 1989
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Akiyoshi, Hiroshi Tamura, Atsushi Kutami, Yoshihiro Takada
  • Endless belt
    Patent number: 4772253
    Abstract: A wide seamless endless belt. A belt comprising a wide seamless endless-belt-like sheet metal 10 to 50 .mu.m, and a lining layer made of flexible material provided on the inside surface thereof and carrying a mechanical force required for belt. This endless belt is used as a substrate of a photosensitive belt for an electrostatic photographic copying machine.
    Type: Grant
    Filed: April 9, 1987
    Date of Patent: September 20, 1988
    Assignee: Ricoh Company, Ltd.
    Inventors: Yutaka Koizumi, Hidetoshi Yano, Hideki Akiyoshi
  • Dual layer electrode used with electrophotographic photoconductor
    Patent number: 4764442
    Abstract: An electrode for use with an electrophotographic photoconductor comprising a non-aluminum metal layer and an aluminum layer which are successively formed on a substrate, thereby constituting a double-layered electrode, and an electrophotographic photoconductor including the double layered electrode are disclosed.
    Type: Grant
    Filed: November 25, 1986
    Date of Patent: August 16, 1988
    Assignee: Ricoh Company, Ltd.
    Inventors: Satoshi Otomura, Hideki Akiyoshi
  • Photosensitive material for electrophotography contains organic phosphite compounds
    Patent number: 4741981
    Abstract: This invention relates to a layered type photosensitive material for electrophotography, which comprises a charge generating layer and a charge transfer layer on an electroconductive substrate, characterized by containing a trivalent organic phosphite compound as an agent for preventing light-degradation.
    Type: Grant
    Filed: July 24, 1986
    Date of Patent: May 3, 1988
    Assignee: Ricoh Co., Ltd.
    Inventors: Junichiro Hashimoto, Izumi Aiso, Hideki Akiyoshi
  • Halogen doped selenium-tellurium alloy electrophotographic photoconductor
    Patent number: 4286035
    Abstract: An electrophotographic photoconductor comprising an electroconductive base and a photosensitive layer formed thereon, the photosensitive layer comprising a selenium-tellurium alloy with a concentration of tellurium in the range of 5 to 20 wt. % and halogen, with a concentration in the range of 5 to 500 ppm, selected from the group consisting of fluorine, chlorine, bromine and iodine, in the photosensitive layer, with the concentration of tellurium substantially uniform or increasing in the direction toward the surface of the photosensitive layer and the ratio of the concentration of tellurium near the electroconductive base to the concentration of tellurium near the surface of said photosensitive layer being 65 or more:100.
    Type: Grant
    Filed: May 28, 1980
    Date of Patent: August 25, 1981
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideyo Nishizima, Hideaki Ema, Hiroshi Tamura, Hideki Akiyoshi