Patents by Inventor Masaru Ujigawa

Masaru Ujigawa 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: 6055969
    Abstract: In order to reduce the bulk and weight of the upper igniter case division of the armor case, and to lower the center of gravity of the total apparatus so as to provide an igniter which is tough to oscillate, the igniter for the internal combustion engine has the armor case equipped with the coil department and igniter unit therein, and said armor case has the igniter case having the coil department case and the connector department. Furthermore, the coil department case is inserted in the plug hole of the internal combustion engine. The igniter unit is mounted in the igniter case. Furthermore, the igniter unit has a semiconductor device of a simple substance silicon chip having integrated therein a semi-conductor for switching and a current limiting circuitry. The semi-conductor for switching consists of an insulated bipolar transistor (IGBT) or a power transistor.
    Type: Grant
    Filed: February 24, 1999
    Date of Patent: May 2, 2000
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Hidetoshi Oishi, Noboru Sugiura, Kazutoshi Kobayashi, Hiroshi Watanabe, Katsuaki Fukatsu, Eiichiro Kondo, Yoichi Anzo, Masaru Ujigawa, Junichi Shimada, Kenji Nakabayashi
  • Patent number: 5915367
    Abstract: In order to reduce the bulk and weight of the upper igniter case division of an armor case, and to lower the center of gravity of the total apparatus so as to provide an igniter which is tough to oscillate, the igniter for the internal combustion engine has the armor case equipped with a coil compartment and igniter unit. The armor case has the igniter case having the coil case and connector. Furthermore, the coil compartment case is inserted in the plug hole of the internal combustion engine. The igniter unit is mounted in the igniter case. Furthermore, the igniter unit has a semiconductor device of a single substance silicon chip having integrated therein a semi-conductor for switching and a current limiting circuitry. The semi-conductor for switching consists of an insulated bipolar transistor (IGBT) or a power transistor.
    Type: Grant
    Filed: September 3, 1997
    Date of Patent: June 29, 1999
    Assignees: Hitachi, Ltd., Hitachi Car Engineering Co., Ltd.
    Inventors: Hidetoshi Oishi, Noboru Sugiura, Kazutoshi Kobayashi, Hiroshi Watanabe, Katsuaki Fukatsu, Eiichiro Kondo, Yoichi Anzo, Masaru Ujigawa, Junichi Shimada, Kenji Nakabayashi
  • Patent number: 5842457
    Abstract: A distributor for internal combustion engines which includes a connector for electrically coupling a rotation signal detector and an engine control unit and a connector for electrically coupling an ignition coil and the engine control unit, the distributor being constructed to be able to improve working efficiency and productivity during assembly and handling easiness during maintenance.
    Type: Grant
    Filed: January 3, 1997
    Date of Patent: December 1, 1998
    Assignees: Hitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
    Inventors: Takao Terakado, Masaru Ujigawa, Toshiaki Kaminaga
  • Patent number: 5651352
    Abstract: A distributor for internal combustion engines which includes a connector for electrically coupling a rotation signal detector and an engine control unit and a connector for electrically coupling an ignition coil and the engine control unit, the distributor being constructed to be able to improve working efficiency and productivity during assembly and handling easiness during maintenance.
    Type: Grant
    Filed: January 25, 1995
    Date of Patent: July 29, 1997
    Assignees: Hitachi, Ltd., Hitachi Automotive Engineering Co., Ltd.
    Inventors: Takao Terakado, Masaru Ujigawa, Toshiaki Kaminaga