Patents by Inventor Tetsuo Yoshihara

Tetsuo Yoshihara 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).

  • Method for forming an electrical contact material
    Patent number: 5480472
    Abstract: A method for forming an electrical contact material comprises the steps of melting a mixture of Cu and Cr into a molten alloy, atomizing the molten alloy into fine particles to obtain alloyed particles. Cr particles in the alloyed powder disintegrate to less than 5 .mu.m in mean particle diameter. The alloyed powder is sintered thereafter and a mean particle diameter of chromium in the sintered article is fined in a range of 2 to 20 .mu.m. An electrical contact material is composed of a copper matrix and chromium particles having a mean particle diameter of 2 to 20 .mu.m. The chromium particles are homogeneously dispersed in the copper matrix.
    Type: Grant
    Filed: July 30, 1991
    Date of Patent: January 2, 1996
    Assignee: Kabushiki Kaisha Meidensha
    Inventors: Yasushi Noda, Nobuyuki Yoshioka, Nobutaka Suzuki, Toshimasa Fukai, Tetsuo Yoshihara, Koichi Koshiro