Patents by Inventor Kazumasa Tezuka

Kazumasa Tezuka 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 for decomposing nitrogen fluoride or sulfur fluoride and decomposing reagent used therefor
    Patent number: 6416726
    Abstract: A method for decomposing nitrogen fluoride or sulfur fluoride, comprising contacting gaseous nitrogen fluoride or sulfur fluoride with a solid reagent comprising elemental carbon, one or more of the alkaline earth metal elements and optionally one or more of the alkali metal elements, to fix the fluorine component in the nitrogen fluoride or sulfur fluoride in said reagent.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: July 9, 2002
    Assignees: Showa Denko K.K., Dowa Mining Co., Ltd., Dowa Iron Powder Co., Ltd.
    Inventors: Chiaki Izumikawa, Kazumasa Tezuka, Kazuto Ito, Hitoshi Atobe, Toraichi Kaneko
  • Process for decomposing fluorocarbons reagent and apparatus used therefor
    Patent number: 6294709
    Abstract: Fluorocarbons including perfluorocarbons and hydrofluorocarbons are highly efficiently decomposed by contacting a gaseous fluorocarbon with a reagent comprising carbon and an alkaline earth metal or carbon, an alkaline earth metal and an alkali metal at an elevated temperature, the decomposed halogen being fixed to the reagent.
    Type: Grant
    Filed: August 12, 1998
    Date of Patent: September 25, 2001
    Assignees: Dowa Mining Co., Ltd., Dowa Iron Power Co., Ltd., Showa Denko K.K.
    Inventors: Chiaki Izumikawa, Kazumasa Tezuka, Kazuto Ito, Hitoshi Atobe, Toraichi Kaneko
  • Method for decomposing nitrogen fluoride or sulfur fluoride and decomposing reagent used therefor
    Publication number: 20010013590
    Abstract: A method for decomposing nitrogen fluoride or sulfur fluoride, comprising contacting gaseous nitrogen fluoride or sulfur fluoride with a solid reagent comprising elemental carbon, one or more of the alkaline earth metal elements and optionally one or more of the alkali metal elements, to fix the fluorine component in the nitrogen fluoride or sulfur fluoride in said reagent.
    Type: Application
    Filed: January 29, 2001
    Publication date: August 16, 2001
    Inventors: Chiaki Izumikawa, Kazumasa Tezuka, Kazuto Ito, Hitoshi Atobe, Toraichi Kaneko
  • Reagent for decomposing fluorocarbons
    Patent number: 6022489
    Abstract: Fluorocarbons including perfluorocarbons and hydrofluorocarbons are highly efficiently decomposed by contacting a gaseous fluorocarbon with a reagent comprising carbon and an alkaline earth metal or carbon, an alkaline earth metal and an alkali metal at an elevated temperature, the decomposed halogen being fixed to the reagent.
    Type: Grant
    Filed: June 26, 1997
    Date of Patent: February 8, 2000
    Assignees: Dowa Mining Co., Ltd., Dowa Iron Powder Co., Ltd., Showa Denko K.K.
    Inventors: Chiaki Izumikawa, Kazumasa Tezuka, Kazuto Ito, Hitoshi Atobe, Toraichi Kaneko
  • Method for measuring the basic amount in basic aluminum sulfate solution for removal of SO.sub.2 gas
    Patent number: 4251497
    Abstract: Reaction heat values of basic aluminum sulfate solution with acid such as sulfuric acid are correlative with an amount of base contained in said solution. The difference of temperatures of said solution before and after its reaction with said acid is utilized as an indication for the calibration of the basic amount in the solution. This calibration is effectively utilized for the control of the basic amount of said solution which is employed in the removal of SO.sub.2 gas from a waste gas.
    Type: Grant
    Filed: April 6, 1979
    Date of Patent: February 17, 1981
    Assignees: Dowa Mining Co. Ltd., Dowa Engineering Co. Ltd.
    Inventors: Kazumasa Tezuka, Seiichi Hisano, Hyoichi Sasaki, Ikuo Watanabe