Patents by Inventor Kazuhiro Kumasaka

Kazuhiro Kumasaka 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).

  • Semi-hard magnetic alloy with composite magnetic property and method of making the same
    Patent number: 4028144
    Abstract: A semi-hard magnetic alloy is described which consists of, by weight, 15-50% Co, 5-25% Ni, 1-9% Cr, balance Fe and incidental impurities and containing further a positive amount of up to 10% Cu or Ti. The alloy is characterized by exhibiting composite hysteresis characteristics as shown in FIG. 3 of the drawings. The alloy may be produced by a repetitive cold-working and subsequent annealing steps, the annealing step being carried out at temperatures of between 450.degree. and 750.degree. C.
    Type: Grant
    Filed: August 14, 1975
    Date of Patent: June 7, 1977
    Assignee: Nippon Telegraph and Telephone Public Corporation
    Inventors: Hiroshi Tomishima, Toshio Takahashi, Kenichi Ono, Kazuhiro Kumasaka