Patents by Inventor Akira Shiki

Akira Shiki 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).

  • Muffler with catalyst for internal combustion engine
    Patent number: 4579194
    Abstract: A muffler for internal combustion engine houses a catalyst for exhaust gas purification and is provided with an exhaust gas inlet pipe through which exhaust gas from the engine is fed to the upstream side of the catalyst. The exhaust gas inlet pipe includes an inlet pipe section provided therein with a venturi section through which atmospheric air as secondary air is inducted into the exhaust gas inlet pipe. The inlet pipe section is extended in the direction of exhaust gas flow to form an extension pipe section which has a length of at least two times the inner diameter of the extension pipe section, thereby suppressing cutoff frequency at lower levels.
    Type: Grant
    Filed: February 26, 1985
    Date of Patent: April 1, 1986
    Assignees: Nissan Motor Co., Ltd., Kabushiki Kaisha Tsuchiya Seisakusho
    Inventors: Akira Shiki, Masaru Nakano, Hideki Nakazima