Patents by Inventor Hiroaki Outani

Hiroaki Outani 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).

  • Noise reducing device for marine propulsion
    Patent number: 4887692
    Abstract: A number of embodiments of silencing devices for marine propulsion units using acoustical lenses that are positioned across either the air inlet device, the air exhaust device or both. The acoustical lenses direct the sound waves in such a way so as to effect silencing while, at the same time, ensuring that water will not enter the engine combustion chambers. The invention is shown in conjunction with both outboard motors and inboard mounted engines.
    Type: Grant
    Filed: April 12, 1988
    Date of Patent: December 19, 1989
    Assignee: Sanshin Kogyo Kabushiki Kaisha
    Inventors: Hiroaki Outani, Seiji Inoue