Patents by Inventor Tokuhisa Tsutsui

Tokuhisa Tsutsui 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).

  • Dynamic-pressure fluid bearing
    Patent number: 6155721
    Abstract: A dynamic-pressure fluid bearing comprises bearing parts formed by a pair of dynamic-pressure surfaces. One of the dynamic-pressure surfaces of the bearing parts is a polyamideimide coating thicker than 3 .mu.m and the other surface is metal. The bearing is particularly applicable to driving motors for polygon mirrors. In addition, a so-called particle removing function is added to one or more of the surfaces of the bearing parts or a position nearby that causes easier removal of dust and other particles accumulated on the parts.
    Type: Grant
    Filed: June 8, 1998
    Date of Patent: December 5, 2000
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Hironori Kurosawa, Tokuhisa Tsutsui, Yasushi Mizusaki, Hiromasa Marumo, Masamichi Hayakawa
  • Dynamic-pressure fluid bearing
    Patent number: 5763967
    Abstract: A dynamic-pressure fluid bearing comprises bearing parts formed by a pair of dynamic-pressure surfaces. One of the dynamic-pressure surfaces of the bearing parts is a polyamideimide coating thicker than 3 .mu.m and the other surface is metal. The bearing is particularly applicable to driving motors for polygon mirrors.
    Type: Grant
    Filed: September 17, 1996
    Date of Patent: June 9, 1998
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventors: Hironori Kurosawa, Tokuhisa Tsutsui, Yasushi Mizusaki, Hiromasa Marumo
  • Bearing material and plastic bearing
    Patent number: 5236784
    Abstract: A bearing material mainly comprising plastics and a plastic bearing made thereof. The bearing material is composed of 30 to 98 wt % of glassy carbon and 70 to 2 wt % of plastics, and has persistent, excellent abrasion resistance, sliding properties, and heat resistance.
    Type: Grant
    Filed: May 1, 1992
    Date of Patent: August 17, 1993
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Toshihiro Kobayashi, Tokuhisa Tsutsui, Yuuki Nakamura
  • Electrochromic display device with the counter electrode being preliminarily held in reduced or oxidized state
    Patent number: 5122896
    Abstract: An electrochromic display device uses a metal-phthalocyanine derivative as an electrochromic material at the display electrode side and a metal-phthalocyanine derivative being preliminarily held in a reduced state or a redox material being stable in an oxidized state at the counter electrode side.
    Type: Grant
    Filed: September 28, 1989
    Date of Patent: June 16, 1992
    Assignee: K.K. Sankyo Seiki Seisakusho
    Inventors: Yasushi Mizusaki, Hiromasa Marumo, Tokuhisa Tsutsui