Patents by Inventor Masashi Koyanagi

Masashi Koyanagi 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).

  • Exhaust silencing device
    Patent number: 5708238
    Abstract: In an exhaust silencing device having inner tubes which are connected to an exhaust pipe connected to an engine and provided with a plurality of through holes, and an outer tube which covers the inner tubes. The occurrence of a whistling sound is prevented while avoiding the use of a sound absorbing material. Recesses are provided on the inner surface of the inner tube, which, together with the outer tube, form an annular expansion chamber.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 13, 1998
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Kosuke Asao, Kazuhiro Yasuda, Masashi Koyanagi, Osamu Sato
  • Elastic mount assembly
    Patent number: 5630575
    Abstract: An elastic seal member includes a watertight seal around the outside of a rubber cushion between the inner and outer cylinder portions and a cover member for covering the outer face of the elastic seal member with a space therebetween so that the elastic seal member is not exposed to water pressure during washing of a vehicle.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: May 20, 1997
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Masashi Koyanagi, Yoshiaki Hamada, Hitoshi Furuhashi, Kazuhiro Yasuda