Patents by Inventor Kouichi Ohshima

Kouichi Ohshima 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: 6348519
    Abstract: Emulsion ink, by which clear images are produced, having excellent drying and fixing properties and preservation stability and does not bleed, strike through or leak. The emulsion ink contains an aqueous emulsified ultraviolet cure compound.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: February 19, 2002
    Assignee: Ricoh Company, Ltd.
    Inventors: Kouichi Ohshima, Masanaga Imamura, Keishi Taniguchi, Eiichi Kawamura, Hiroshi Adachi
  • Patent number: 6063835
    Abstract: Emulsion ink, by which clear images are produced, having excellent drying and fixing properties and preservation stability and does not bleed, strike through or leak. The emulsion ink contains an aqueous emulsified ultraviolet cure compound.
    Type: Grant
    Filed: April 30, 1996
    Date of Patent: May 16, 2000
    Assignee: Ricoh Company, Ltd.
    Inventors: Kouichi Ohshima, Masanaga Imamura, Keishi Taniguchi, Eiichi Kawamura, Hiroshi Adachi
  • Patent number: 5924360
    Abstract: A stencil base sheet includes a thermoplastic resin film, with a surface of the stencil base sheet on the side of the thermoplastic resin film having a surface smoothness of at least 6000 seconds. From this stencil base sheet, a printing master is prepared by use of a heat-emitting resistor with the application of electric signals thereto with pulse modulation corresponding to image recording density, thereby forming perforations of a different size corresponding to recording image density in the stencil base sheet by thermal fusing. Furthermore, a monochrome or multi-color stencil printing is performed by using the printing master.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: July 20, 1999
    Assignees: Ricoh Company, Ltd., Tohoku Ricoh Co., Ltd.
    Inventors: Hiroshi Adachi, Kouichi Ohshima, Masanori Rimoto, Fumiaki Arai, Hiroshi Tateishi, Tetsuo Tanaka
  • Patent number: 4957839
    Abstract: An electrophotographic photoconductor is disclosed, which comprises an electroconductive layer, on which are formed in order, a photoconductive layer, a charge retention layer and a protective layer, optionally an adhesive layer between the charge retention layer and the protective layer, the charge retention layer comprising a silicone resin which comprises: (a) 50 wt. % to 80 wt. % of silicone and oxygen, (b) 10 wt. % to 30 wt. % of carbon, (c) 1 wt. % to 10 wt. % of hydrogen, and (d) 1 wt. % to 10 wt. % of nitrogen. The photoconductive layer may comprise an As-Se alloy, in which case, it is preferable that the amount of As be in the range of 33 wt. % to 38 wt. % and the balance thereof be Se in the As-Se alloy. Preferably the adhesive layer comprises a hardened material containing a metal alkoxide.
    Type: Grant
    Filed: November 21, 1988
    Date of Patent: September 18, 1990
    Assignee: Ricoh Company, Ltd.
    Inventors: Takashi Rokutanzono, Yukio Ide, Hiroshi Nagame, Kouichi Ohshima, Narihito Kojima, Shinji Nosho