Patents by Inventor Tadoa Ohtani

Tadoa Ohtani 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 of making permanent magnets of Mn-Al-C alloy
    Patent number: 3944445
    Abstract: A method of making isotropic Mn-Al-C alloy magnets which comprises the step of subjecting an alloy comprising 71.0% to 73.0% by weight of manganese, (1/10 Mn -- 6.6)% to (1/3 Mn -- 22.2)% by weight of carbon and the remainder aluminum to plastic deformation at a temperature of 550.degree.C to 780.degree.C.By utilizing this method, it is possible to obtain isotropic Mn-Al-C alloy magnets having excellent magnetic characteristics, i.e. (BH)max = 2.0 .times. 10.sup.6 G. Oe or more.
    Type: Grant
    Filed: October 8, 1974
    Date of Patent: March 16, 1976
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tadoa Ohtani, Nobuyuki Kato, Shigeru Kojima, Yoichi Sakamoto, Masaharu Tsukahara, Kiyoshi Kojima, Isago Konno, Takao Kubo