Patents by Inventor Shirou Tomitsuka

Shirou Tomitsuka 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).

  • Aluminum hydroxide and production process thereof
    Patent number: 7247292
    Abstract: A method for producing aluminum hydroxide includes a step of elevating a temperature of a slurry of aluminum hydroxide suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher, and a step of applying a centrifugal force to the slurry. The aluminum hydroxide constituting the slurry is obtained beforehand through the Bayer's process.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: July 24, 2007
    Assignee: Showa Denko K.K.
    Inventors: Akira Onishi, Shirou Tomitsuka, Seisuke Takahashi
  • Aluminum hydroxide and production process thereof
    Patent number: 7101529
    Abstract: A method for producing aluminum hydroxide, comprises the steps of: elevating a temperature of a slurry having agglomerated secondary particles of aluminum hydroxide obtained through the Bayer's process suspended in a sodium aluminate solution from not more than 70° C. to not less than 85° C. within 15 minutes, thereby disintegrating the agglomerated secondary particles; and retaining, for a period of at least 15 minutes from temperature elevation, the temperature of the slurry so as not to be lowered to not less than 80° C.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: September 5, 2006
    Assignee: Showa Denko K.K.
    Inventors: Akira Onishi, Shirou Tomitsuka, Seisuke Takahashi
  • Aluminum hydroxide and production process thereof
    Publication number: 20040013604
    Abstract: A method for producing aluminum hydroxide includes elevating, from 70° C. or lower to 85° C. or higher within 15 minutes, a temperature of a slurry of aluminum hydroxide suspended in a sodium aluminate solution, which aluminum hydroxide has been obtained through the Bayer's process, and then maintaining the temperature of the slurry, without being lowered to 80° C. or lower, for at least 15 minutes from temperature elevation initiation.
    Type: Application
    Filed: March 10, 2003
    Publication date: January 22, 2004
    Inventors: Akira Onishi, Shirou Tomitsuka, Seisuke Takahashi
  • Aluminum hydroxide and production process thereof
    Publication number: 20030185747
    Abstract: A method for producing aluminum hydroxide includes a step of elevating a temperature of a slurry of aluminum hydroxide suspended in a sodium aluminate solution from 70° C. or lower to 85° C. or higher, and a step of applying a centrifugal force to the slurry. The aluminum hydroxide constituting the slurry is obtained beforehand through the Bayer's process.
    Type: Application
    Filed: March 11, 2003
    Publication date: October 2, 2003
    Inventors: Akira Onishi, Shirou Tomitsuka, Seisuke Takahashi