Patents by Inventor Hiroshi Ukaji

Hiroshi Ukaji 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).

  • WDM optical transmission system
    Patent number: 6804468
    Abstract: A WDM optical transmission system in which a retiming unit disposed at the front stage of the optical signal supplying unit of an optical transceiver is provided. The pulse width distortion of an optical signal generated in optical transmission through an optical fiber between two WDM optical transmission apparatus is corrected by the retiming unit after the optical signal has been demultiplexed and converted into an electrical signal.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: October 12, 2004
    Assignee: Hirakawa Hewtech Corporation Mitsubishi Gas Chemical Company, Inc.
    Inventors: Hiroshi Ukaji, Fumito Kuramochi, Toshihiiko Takano, Kuniaki Jinnai
  • Transceiver for local area network
    Patent number: D366878
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: February 6, 1996
    Assignee: Hirakawa Hewtech Corporation
    Inventors: Hiroshi Wakabayashi, Hiroshi Ukaji