Patents by Inventor Akira Doi

Akira Doi 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).

  • Surface treatment process
    Patent number: 4634600
    Abstract: A substrate is treated for forming a thin film on the surface of the substrate to obtain a hard layer adhering to the substrate surface. For this purpose the substrate is placed in a metal vapor atmosphere and simultaneously bombarded by metal or nonmetal ions which are implanted into the substrate while the metal vapor atmosphere is also being ionized.
    Type: Grant
    Filed: June 19, 1985
    Date of Patent: January 6, 1987
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Yasuhiro Shimizu, Akira Doi
  • Sintering method using a plasma gas atmosphere
    Patent number: 4501717
    Abstract: This invention provides a process for producing a high quality powdered alloy such as cemented carbides, cermets, ceramics and iron-containing sintered alloys by sintering, characterized in that the sintering is carried out in a plasma gas atmosphere of H.sub.2, N.sub.2, CO, He and/or Ar.
    Type: Grant
    Filed: July 21, 1983
    Date of Patent: February 26, 1985
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Shinya Tsukamoto, Kunihiro Takahashi, Akira Doi
  • Process for the production of diamond powder
    Patent number: 4485080
    Abstract: Diamond powder is produced without using an ultra-high pressure apparatus by a process comprising melting carbon and a metal capable of dissolving carbon to form a liquid, subjecting the liquid to quenching at an ultra-high cooling rate to form an amorphous metal, heating the amorphous metal at a predetermined temperature to precipitate diamond crystals from the amorphous metal and then separating the phase of the amorphous metal other than the diamond to obtain diamond powder.
    Type: Grant
    Filed: December 12, 1983
    Date of Patent: November 27, 1984
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Hideo Shingu, Keiichi Ishihara, Akira Doi, Naoji Fujimori
  • Coated hard alloys
    Patent number: 4474849
    Abstract: Coated hard alloys excellent in toughness and wear resistance comprise a substrate of hard alloy and at least one coating layer thereon, at least one of the coating layers being of amorphous alumina.
    Type: Grant
    Filed: September 17, 1982
    Date of Patent: October 2, 1984
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Naoji Fujimori, Akira Doi, Yasuhiro Shimizu
  • Cheese-containing composition for dessert making and process for producing the same
    Patent number: 4425369
    Abstract: A cheese-containing composition in the form of an oil-in-water type emulsion useful for dessert making such as cheese cake making which comprises cheese, a liquid selected from the group consisting of milk, skim milk, water and a mixture thereof, an emulsifier and, optionally, a fat ingredient. The cheese-containing composition can be produced by mixing the desired ingredients, homogenizing the resulting mixture, sterilizing the homogenized mixture and then cooling.
    Type: Grant
    Filed: August 31, 1981
    Date of Patent: January 10, 1984
    Assignee: Fuji Oil Company, Ltd.
    Inventors: Kenshi Sakamoto, Akira Doi
  • Method of sintering a ceramic composition
    Patent number: 4383957
    Abstract: A ceramic sintered body with a high density and high surface smoothness is obtained by sintering a ceramic composition comprising oxides as a substantial or partial component in an atmosphere of CO gas or in a mixture of CO gas and an inert gas.
    Type: Grant
    Filed: May 20, 1981
    Date of Patent: May 17, 1983
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventors: Akira Yamakawa, Akira Doi, Yoshihiko Doi