Patents by Inventor Takushi Yamamoto

Takushi Yamamoto 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).

  • Alkali metal acrylate or ammonium acrylate polymer excellent in salt solution-absorbency and process for producing same
    Patent number: 4340706
    Abstract: An alkali metal acrylate polymer obtained by suspending an aqueous solution of acrylic acid and an alkali metal acrylate in an alicyclic or aliphatic hydrocarbon solvent containing a surfactant having an HLB value of 8-12 and subjecting the suspension to inverse suspension polymerization in the presence of a water-soluble radical polymerization initiator has a much higher water-absorbency and particularly salt solution-absorbency than known ones. If said polymer is crosslinked with a crosslinking agent, its stability in the fluid-absorbed state for a long period of time is improved and the absorption rate when absorbing water is also improved.
    Type: Grant
    Filed: November 21, 1980
    Date of Patent: July 20, 1982
    Assignee: Seitetsu Kagaku Co., Ltd.
    Inventors: Shigeji Obayashi, Morio Nakamura, Koichi Fujiki, Takushi Yamamoto