Patents by Inventor Kosuke Takeshige

Kosuke Takeshige 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 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
  • Purification of alkali carbonate containing a fluorine compound
    Patent number: 3980754
    Abstract: An alkali carbonate containing a fluorine compound is purified by dissolving the crude alkali carbonate in an aqueous solution or suspension of magnesium bicarbonate in order to transfer the fluorine impurity into the resulting colloidal flocculated precipitate whereby the fluorine is substantially separated from the aqueous solution of the alkali carbonate.
    Type: Grant
    Filed: August 8, 1975
    Date of Patent: September 14, 1976
    Assignee: Toyo Soda Manufacturing Co., Ltd.
    Inventors: Susumo Otsuki, Junji Arika, Mitsunobu Kashibe, Kosuke Takeshige