Patents by Inventor Noriyoshi Urushiwara

Noriyoshi Urushiwara 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).

  • Electronic distribution type ignition system
    Patent number: 5033445
    Abstract: This specification discloses an electronic distribution type ignition system wherein at least two ignition coils are provided, and wherein the secondary voltage of the ignition coils is directly supplied to spark plugs. An ignition system according to this invention comprises switching circuits for controlling the supply of a primary voltage to said, ignition coils, a resistance element wherein a current flows selectively which corresponds to a primary current for each of two ignition coils, supplied through two of said switching circuit, current control circuits for detecting a terminal voltage of said resistance element and for controlling, according to said terminal voltage, the primary current flowing through each said igniton coil so as to be at a target value, and a board having said resistance element formed thereon.
    Type: Grant
    Filed: July 6, 1990
    Date of Patent: July 23, 1991
    Assignee: Hitachi, Ltd.
    Inventors: Ryoichi Kobayashi, Noriyoshi Urushiwara
  • Electronic circuit apparatus of automobile
    Patent number: 4893215
    Abstract: Electronic circuits (11,12) are mounted on a metal base (13). The metal base is covered by a mold resin case (16) at the peripheral portion thereof. A projected portion (29) is formed along all the peripheral edge portion of the metal base. A step portion is formed to the metal base next to the projected portion of the metal base. A groove (28) is formed along all the peripheral portion of the bottom surface of the mold resin case. The projected portion is engaged to the groove which is filled with a bonding material (33). The bottom surface of the step portion is also covered by the bonding material when the projected portion is thrust into the groove of the mold resin case.
    Type: Grant
    Filed: September 22, 1988
    Date of Patent: January 9, 1990
    Assignee: Hitachi, Ltd.
    Inventors: Noriyoshi Urushiwara, Noboru Kobayashi, Ryoichi Kobayashi
  • Ignition system for internal combustion engine
    Patent number: 4854292
    Abstract: An ignition system for an internal combustion engine comprising a semiconductor switching device, which is controlled by a control unit, is disclosed. In response to an output from a device for detecting a shorting breakdown or a heat generation of a power switching device, the power switching device and the ignition coil are cut off from a power supply by a current cut-off device. Even when the power switching device is broken by shorting, the power generation due to continuous energization of the ignition coil is prevented, thereby preventing the ignition coil from being heated abnormally.
    Type: Grant
    Filed: March 25, 1988
    Date of Patent: August 8, 1989
    Assignee: Hitachi, Ltd.
    Inventors: Noriyoshi Urushiwara, Noboru Sugiura, Yasunori Fujino, Ryoichi Kobayashi