Patents by Inventor Yukio Ohnuki

Yukio Ohnuki 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).

  • Magnetic recording medium comprising a magnetic film layer and a coating of purified perfluoropolyether lubricant
    Patent number: 5468552
    Abstract: A magnetic recording medium having coated thereon a lubricant of such a purity that no impurities and low molecular weight species are substantially detected by gel permeation chromatography.
    Type: Grant
    Filed: August 26, 1993
    Date of Patent: November 21, 1995
    Assignee: Tosoh Corporation
    Inventors: Yukio Ohnuki, Satoshi Kurosawa, Akio Kondo
  • Magnetic recording medium comprising a magnetic film layer and a coating of purified perfluoropolyther lubricant
    Patent number: 5292585
    Abstract: A magnetic recording medium having coated thereon a lubricant of such a purity that no impurities and low molecular weight species are substantially detected by gel permeation chromatography.
    Type: Grant
    Filed: August 30, 1991
    Date of Patent: March 8, 1994
    Assignee: Tosoh Corporation
    Inventors: Yukio Ohnuki, Satoshi Kurosawa, Akio Kondo
  • Power transmission system for a four-wheel drive motor vehicle
    Patent number: 5234091
    Abstract: A casing is provided in a power train of a four-wheel drive motor vehicle and supported on a body of the vehicle. A fluid operated multiple-disk friction clutch is disposed in the casing. The clutch has a drive drum operatively connected to an input member of the power train and a driven drum operatively connected to an output member of the power train, and a piston slidably mounted in a piston chamber and operated by oil supplied to the piston chamber for engaging the drive drum with the driven drum. A hydraulic circuit having an oil pump is provided for exclusively supplying oil to the piston chamber.
    Type: Grant
    Filed: June 29, 1992
    Date of Patent: August 10, 1993
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Toshio Kobayashi, Keiichi Maruyama, Yukio Ohnuki
  • Power transmission system for a four-wheel drive motor vehicle
    Patent number: 5148903
    Abstract: A casing is provided in a power train of a four-wheel drive motor vehicle and supported on a body of the vehicle. A fluid-operated multiple-disk friction clutch is disposed in the casing. The clutch has a drive drum operatively connected to an input member of the power train and a driven drum operatively connected to an output member of the power train, and a piston slidably mounted in a piston chamber and operated by oil supplied to the piston chamber for engaging the drive drum with the driven drum. A hydraulic circuit having an oil pump is provided for exclusively supplying oil to the piston chamber.
    Type: Grant
    Filed: February 8, 1991
    Date of Patent: September 22, 1992
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Toshio Kobayashi, Keiichi Maruyama, Yukio Ohnuki
  • Selectively permeable film and ion sensor
    Patent number: 4563263
    Abstract: A selectively permeable film directly applied to coat the surface of an electroconductive element, said electively permeable film comprising a polymer which is derived from at least one aromatic compound selected from the group of nitrogen-containing aromatic compounds or from the group of hydroxy aromatic compounds. The nitrogen-containing aromatic compounds are aniline, 2-aminobenzotrifluoride, 2-aminopyridine, 2,3-diaminopyridine, 4,4'-diaminodiphenyl ether, 4,4'-methylenedianiline, tyramine, N-(o-hydroxybenzyl)-aniline and pyrrole. The film coated on the electrode surfaces permits selective passage of ions and the electrode can be used as an ions sensor for measuring the concentration of ions in solutions.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: January 7, 1986
    Assignee: Terumo Corporation
    Inventors: Noboru Oyama, Hiroaki Matsuda, Eishun Tsuchida, Yukio Ohnuki, Takeshi Shimomura, Norihiko Ushizawa