Patents by Inventor Mitsuhiro Harima

Mitsuhiro Harima 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).

  • Contact material for vacuum circuit breaker
    Patent number: 4677264
    Abstract: The present invention provides a contact material for a vacuum circuit breaker containing therein copper (Cu) and chromium (Cr) with further addition of at least one kind of boride selected from borides of chromium (Cr), molybdenum (Mo) and tungsten (W). Such contact material possesses remarkable advantages of having large current breaking capability and high voltage withstand capability.
    Type: Grant
    Filed: December 5, 1985
    Date of Patent: June 30, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Mitsuhiro Okumura, Eizo Naya, Mitsuhiro Harima, Shoji Murakami, Seiichi Miyamoto