Patents by Inventor Chuki Ikeda

Chuki Ikeda 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).

  • Wire on cable coated with a bow-tie tree resistant electrical insulating composition
    Patent number: 5420185
    Abstract: A bow-tie tree resistant electrical insulating composition comprises 100 parts by weight of at least one polymer selected from polyolefins and ethylene copolymers, 0.005-1.0 part by weight of a metal salt of a fatty acid containing a hydroxyl group in the molecule, and 0.005-1.0 part by weight of a fatty acid or a derivative thereof.
    Type: Grant
    Filed: September 14, 1994
    Date of Patent: May 30, 1995
    Assignee: Hitachi Cable Ltd.
    Inventors: Kiyoshi Watanabe, Takanori Yamazaki, Hideki Yagyu, Mamoru Kanaoka, Katsutoshi Hanawa, Chuki Ikeda
  • Method for detecting partial discharge in an insulation of an electric power apparatus
    Patent number: 5323117
    Abstract: In an electric apparatus such as an electric power cable system, a high frequency pulse is induced on a conductive member such as a metal sheath, where partial discharge occurs in an insulation. The high frequency pulse is detected by means of a bypass lead wire, a metal foil electrode, a detecting coil, and the like provided on the electric apparatus without interrupting a live operation of the electric apparatus.
    Type: Grant
    Filed: October 28, 1991
    Date of Patent: June 21, 1994
    Assignee: Hitachi Cable, Ltd.
    Inventors: Takeshi Endoh, Tomoaki Imai, Mikio Hagiya, Chuki Ikeda
  • Method for diagnosing an insulation deterioration of a power cable
    Patent number: 4980645
    Abstract: A power cable such as a rubber or plastic insulated power cable is diagnosed to be detected an insulation deterioration resulted from water tree generated in an insulation material thereof. At first, charging current flowing from the power cable through a grounding conductor connected to a metal shielding layer thereof to the ground is measured under a state that a rated AC voltage is applied to the power cable. In accordance with the charging current, stray current flowing from the ground to the power cable is calculated. Then, a direct current component of the charging current is detected, and an intrinsic direct current component is calculated by subtracting the stray current from the direct current component. The insulation deterioration is diagnosed in accordance with the level of the intrinsic direct current component.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: December 25, 1990
    Assignee: Hitachi Cable, Ltd.
    Inventors: Kenichiro Soma, Kazuo Kotani, Nobuju Takaoka, Chuki Ikeda, Moritada Marumo
  • Device for cross-linking of coating material such as rubber or plastic, for electric wire
    Patent number: 4174677
    Abstract: A device for cross-linking of coating material such as rubber or plastic having a vertical or inclined cross-linking tube including a heating portion and a succeeding cooling portion, said heating portion comprising at the side thereof a gas circulating passage having a gas supply device, a gas heating device, a gas cooling device and a filter, said gas circulating passage communicating with an exhaust port above the heating portion and with a gas supply port below the heating portion so that the gas circulate in a direction opposed to the traveling direction of a conducting strand passing therethrough, whereby said conductive strand is heated and cross-linked while residue emitted from the coating material of said conductive strand is effectively removed.
    Type: Grant
    Filed: January 27, 1978
    Date of Patent: November 20, 1979
    Assignee: Hitachi Cable, Ltd.
    Inventors: Hiroo Nagano, Chuki Ikeda, Kenji Takahashi, Naoyoshi Kato, Norio Sato