Patents by Inventor Tsutomu Hiramatsu

Tsutomu Hiramatsu 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).

  • Apparatus for detecting misfire in multicylinder internal combustion engine
    Patent number: 4040294
    Abstract: An apparatus for detecting misfire in a multicylinder internal combustion engine, comprising a sound pick-up transducer disposed in the exhaust passage of the engine or a chamber communicating with the exhaust passage for the purpose of detecting exhaust sound, an integrating circuit for integrating an electric output of the transducer in synchronism with the rotation of the engine and a comparison circuit for comparing the output of the integrating circuit with a reference signal, thereby misfire being detected on the basis of an output of the comparison circuit.
    Type: Grant
    Filed: September 29, 1976
    Date of Patent: August 9, 1977
    Assignee: Hitachi, Ltd.
    Inventors: Yasumasa Matsuda, Ichiro Kimura, Akio Sagawa, Tsutomu Hiramatsu