Patents by Inventor Masaharu Tsukahara

Masaharu Tsukahara 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).

  • Magnetic alloys having wasp-waisted magnetic hysteresis loop
    Patent number: 4042429
    Abstract: Magnetic alloys consisting of 68.0.about.73.0 weight % manganese, (1/10 Mn - 6.6).about.(1/3 Mn - 22.2) weight % carbon, the balance aluminum, which show wasp-waisted magnetic hysteresis loops with the ratio of the residual magnetization 4.pi.I.sub.r to the intensity of magnetization 4.pi.I.sub.10000 in a magnetic field of 10000 Oe, I.sub.r /I.sub.10000, falling 0.0.about.0.2.
    Type: Grant
    Filed: October 1, 1974
    Date of Patent: August 16, 1977
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Shigeru Kojima, Kiyoshi Kojima, Tadao Ohtani, Nobuyuki Kato, Yoichi Sakamoto, Isago Konno, Masaharu Tsukahara, Takao Kubo
  • Anisotropic permanent magnet of Mn-Al-C alloy
    Patent number: 4023991
    Abstract: An anisotropic permanent magnet of an Mn-Al-C alloy containing 68.0% to 73.0% by weight of manganese, (1/10Mn-6.6)% to (1/3Mn-22.2)% by weight of carbon, and the remainder aluminum, which alloy is rendered anisotropic by deforming it plastically at a temperature of 530.degree. to 830.degree. C.The permanent magnet has excellent mechanical characteristics and magnetic properties such that the (BH) max is above 4.8 .times. 10.sup.6 G.Oe up to about 9.2 .times. 10.sup.6 G.Oe in its bulk state.
    Type: Grant
    Filed: June 1, 1976
    Date of Patent: May 17, 1977
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takao Kubo, Tadao Ohtani, Shigeru Kojima, Nobuyuki Kato, Kiyoshi Kojima, Yoichi Sakamoto, Isago Konno, Masaharu Tsukahara
  • Machinable anisotropic permanent magnets of Mn-Al-C alloys
    Patent number: 3976519
    Abstract: An anisotropic permanent magnet of an Mn-Al-C alloy containing 68.0% 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, which alloy is rendered anisotropic by deforming it plastically at a temperature of 530.degree.C to 830.degree.C.The permanent magnet has excellent mechanical characteristics and magnetic properties such that the (BH)max is above 4.8 .times. 10.sup.6 G.Oe up to about 9.2 .times. 10.sup.6 G.Oe in its bulk state.
    Type: Grant
    Filed: July 23, 1974
    Date of Patent: August 24, 1976
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Takao Kubo, Tadao Ohtani, Shigeru Kojima, Nobuyuki Kato, Kiyoshi Kojima, Yoichi Sakamoto, Isago Konno, Masaharu Tsukahara
  • 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