Patents by Inventor Takashi Yokhikawa

Takashi Yokhikawa 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 manufacturing alloy rod having giant magnetostriction
    Patent number: 5067551
    Abstract: A method for manufacturing an alloy rod having giant magnetostriction, which comprises the steps of: supplying a granular or flaky alloy material, which comprises at least two rare earth metals including terbium and dysprosium and at least one transition metal, into a tubular crucible in an inert gas atmosphere kept under a pressure of from 0.2 to 10 atm., arranged in a vertical cylindrical heating furnace; totally melting the alloy material in the crucible in the heating furnace; and then vertically moving any one of the crucible and the heating furnace at a speed of from 0.1 to 5.0 mm/minute in a temperature region of from 1,270.degree. to 1,180.degree. C. of the heating furnace, in which a temperature decreases at a temperature gradient of from 10.degree. to 100.degree. C.
    Type: Grant
    Filed: June 18, 1990
    Date of Patent: November 26, 1991
    Assignees: NKK Corporation, Japan Marine Science and Technology Center, Oki Electric Industry Co., Ltd.
    Inventors: Katsuhiko Murakami, Nobuo Yamagami, Toshiyuki Nakanishi, Iwao Nakano, Keiichi Kobayashi, Takashi Yokhikawa