Patents by Inventor Masaharu Yida

Masaharu Yida 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).

  • Ag-SnO.sub.2 electrical contact materials
    Patent number: 5147728
    Abstract: Novel Ag-SnO electrical contact materials are disclosed, which are made of Ag alloys consisting of 5-20 weight % of Sn and a balance of Ag, the alloys having been prepared by melting and having been internal oxidized. Novel manufacturing methods are also disclosed, in which internal-oxidation is conducted in an oxygen atmosphere of 10 atm to 200 atm, and at a temperature of 750.degree. C. to 500.degree. C.
    Type: Grant
    Filed: July 5, 1991
    Date of Patent: September 15, 1992
    Inventors: Seiichi Tanaka, Teruo Hirata, Masaharu Yida
  • Ag-SnO-CdO electrical contact materials and manufacturing method thereof
    Patent number: 5102480
    Abstract: Novel Ag-SnO-CdO electrical contact materials are disclosed, which are made of ternary Ag alloys consisting of more than 5-12 weight % of Sn, 0.5-5 weight % of Cd, and a balance of Ag, the alloys having been prepared by melting and having been internal oxidized. Novel manufacturing methods are also disclosed, in which internal-oxidation is conducted in an oxygen atmosphere of more than 10 atm to 200 atm, at a temperature of 750.degree. C. to 500.degree. C., and at a condition that the alloys are kept at a solid phase not involving any liquid phase.
    Type: Grant
    Filed: January 14, 1991
    Date of Patent: April 7, 1992
    Assignee: Chugai Denki Kogyo K.K.
    Inventors: Seiichi Tanaka, Teruo Hirata, Masaharu Yida
  • Method of making Ag-SnO contact materials by high pressure internal oxidation
    Patent number: 5078810
    Abstract: Novel Ag-SnO electrical contact materials are disclosed, which are made of Ag alloys consisting of 5-20 weight % of Sn and a balance of Ag, the alloys having been prepared by melting and having been internal oxidized. Novel manufacturing methods are also disclosed, in which internal-oxidation is conducted in an oxygen atmosphere of 10 atm to 200 atm, and at a temperature of 750.degree. C. to 500.degree. C.
    Type: Grant
    Filed: February 8, 1990
    Date of Patent: January 7, 1992
    Inventors: Seiichi Tanaka, Teruo Hirata, Masaharu Yida
  • Internal-oxidation method of electrical contact materials and the materials produced thereby
    Patent number: 4981533
    Abstract: Electrical contact materials are made by the internal-oxidation of Ag alloys containing more than 5 weight % of Sn, with the assistance of Pb or Zr contained at an amount as minimum as possible. Complete and uniform internal-oxidation of said Sn contents are obtained primarily on account of the internal oxidation conducted at an elevated oxygen atmospheric pressure, that is, 10 to 150 atm.
    Type: Grant
    Filed: February 5, 1990
    Date of Patent: January 1, 1991
    Assignee: Chugai Denki Kogyo K.K.
    Inventor: Masaharu Yida