Patents by Inventor Michiharu Oogai

Michiharu Oogai 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).

  • Zirconia sintered body, process for production thereof, and application thereof
    Patent number: 6087285
    Abstract: A novel zirconia sintered body is provided which contains Y.sub.2 O.sub.3 in a solid solution state, and has tetragonal crystal grains oriented at an orientation degree of not higher than 45%. A process for producing the zirconia sintered body is also provided. This zirconium sintered body deteriorates less, and excellent in stability of surface smoothness, and can be produced by a simple process.
    Type: Grant
    Filed: October 8, 1998
    Date of Patent: July 11, 2000
    Assignee: Tosoh Corporation
    Inventors: Nobukatsu Oomichi, Koji Matsui, Akemi Kato, Michiharu Oogai
  • Method of producing cation-exchange membrane having roughed surface
    Patent number: 4537910
    Abstract: A method of producing a cation-exchange membrane having roughed surface which is characterized in mixing silica powder with water to give a suspended or pasty mixture, supporting the resultant mixture on art paper or filter paper, drying the mixture to form silica powder layer, adhering with heating and pressing the silica powder layer on surface of membrane composed of perfluorocarbon polymer, and removing the silica powder layer formed on the surface of said membrane with caustic alkali aqueous solution.
    Type: Grant
    Filed: November 9, 1983
    Date of Patent: August 27, 1985
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Michiharu Oogai, Toru Seita, Kosuke Takeshige, Hideo Shuyama