Patents by Inventor Seiji Gou

Seiji Gou 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).

  • Antenna device for mobile communication terminal
    Patent number: 6753827
    Abstract: A first antenna is movable between a first position pulled out from the communication terminal and a second position accommodated in a mobile communication terminal. A second antenna is built in the communication terminal. A first switch electrically connects only the first antenna with a power feeding circuit via an impedance matching circuit when the first antenna is placed at the first position, and electrically connects only the second antenna with the power feeding circuit when the first antenna is placed at the second position. A second switch grounds the second antenna in cooperation with the first switch, when the first antenna is placed at the second position.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: June 22, 2004
    Assignee: Yokowo Co., Ltd.
    Inventors: Tadashi Oshiyama, Seiji Gou
  • Antenna device for mobile communication terminal
    Publication number: 20030132886
    Abstract: A first antenna is movable between a first position pulled out from the communication terminal and a second position accommodated in a mobile communication terminal. A second antenna is built in the communication terminal. A first switch electrically connects only the first antenna with a power feeding circuit via an impedance matching circuit when the first antenna is placed at the first position, and electrically connects only the second antenna with the power feeding circuit when the first antenna is placed at the second position. A second switch grounds the second antenna in cooperation with the first switch, when the first antenna is placed at the second position.
    Type: Application
    Filed: January 15, 2003
    Publication date: July 17, 2003
    Applicant: Yokowo Co., Ltd.
    Inventors: Tadashi Oshiyama, Seiji Gou
  • Antenna device for mobile tele-communication terminal
    Patent number: 6522300
    Abstract: A whip antenna is movable between a first position corresponding to a state in which the whip antenna is extended from a casing of the mobile communication terminal, and a second position corresponding to a state the whip antenna is accommodated within the casing. A built-in antenna is disposed within the casing. A power feeding circuit is disposed within the casing. A first matching circuit has a first impedance, through which the power feeding circuit and the whip antenna are electrically connected when the whip antenna is placed at the first position. A second matching circuit has a second impedance which is higher than the first impedance, through which the whip antenna is grounded when the whip antenna is placed at the second position. A switch mechanism is opened so that the built-in antenna is electrically disconnected from the power feeding circuit when the whip antenna is placed at the first position, and closed so that the built-in antenna is electrically connected to the power feeding circuit.
    Type: Grant
    Filed: December 28, 2001
    Date of Patent: February 18, 2003
    Assignee: Yokowo Co., Ltd.
    Inventors: Tadashi Oshiyama, Atsushi Sato, Katsutoshi Okubo, Takao Kawahara, Seiji Gou
  • Antenna device for mobile tele-communication terminal
    Publication number: 20020126050
    Abstract: A whip antenna is movable between a first position corresponding to a state in which the whip antenna is extended from a casing of the mobile communication terminal, and a second position corresponding to a state the whip antenna is accommodated within the casing. A built-in antenna is disposed within the casing. A power feeding circuit is disposed within the casing. A first matching circuit has a first impedance, through which the power feeding circuit and the whip antenna are electrically connected when the whip antenna is placed at the first position. A second matching circuit has a second impedance which is higher than the first impedance, through which the whip antenna is grounded when the whip antenna is placed at the second position. A switch mechanism is opened so that the built-in antenna is electrically disconnected from the power feeding circuit when the whip antenna is placed at the first position, and closed so that the built-in antenna is electrically connected to the power feeding circuit.
    Type: Application
    Filed: December 28, 2001
    Publication date: September 12, 2002
    Applicant: Yokowo Co., Ltd.
    Inventors: Tadashi Oshiyama, Atsushi Sato, Katsutoshi Okubo, Takao Kawahara, Seiji Gou