Patents by Inventor Katsuhiko Yamakawa

Katsuhiko Yamakawa 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: 5917453
    Abstract: An illuminant-mounted antenna includes a rod-shaped antenna element, an illuminant mounted on top of the rod-shaped antenna element, and lighting means for lighting the illuminant by high frequency energy generated on the rod-shaped antenna element when a portable transceiver is operated. The lighting means includes a high frequency detecting diode and an inductive element. One end of the high frequency detecting diode and one end of the inductive element are connected in common to the top of the rod-shaped antenna element, and the other end of the high frequency detecting diode and the other end of the inductive element are connected to both ends of the illuminant.
    Type: Grant
    Filed: March 7, 1997
    Date of Patent: June 29, 1999
    Assignee: Harada Industry Co., Ltd.
    Inventors: Shigeru Uchino, Katsuhiko Yamakawa
  • Patent number: 5406296
    Abstract: A three-wave antenna for vehicles which includes a monopole antenna element which has an electrical length of approximately 1/4 of the wavelength in the FM broadcast band along with a double sleeve used to prevent current flow and with a second double sleeve used for phase adjustment that are installed coaxially with the antenna element. The positional relationships between the inner and outer cylinders of each one of the first and second double sleeves relative to the antenna element are respectively specified.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: April 11, 1995
    Assignee: Harada Kogyo Kabushiki Kaisha
    Inventors: Yoshimi Egashira, Katsuhiko Yamakawa
  • Patent number: D388096
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: December 23, 1997
    Assignee: Harada Industry Co., Ltd.
    Inventors: Katsuhiko Yamakawa, Shigeru Uchino
  • Patent number: D388097
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: December 23, 1997
    Assignee: Harada Industry Co., Ltd.
    Inventors: Katsuhiko Yamakawa, Shigeru Uchino
  • Patent number: D388098
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: December 23, 1997
    Assignee: Harada Industry Co., Ltd.
    Inventors: Katsuhiko Yamakawa, Shigeru Uchino
  • Patent number: D388099
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: December 23, 1997
    Assignee: Harada Industry Co., Ltd.
    Inventors: Katsuhiko Yamakawa, Shigeru Uchino