Patents by Inventor Wataru Tohoma

Wataru Tohoma 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).

  • Amphoteric polyelectrolyte
    Patent number: 4251651
    Abstract: An amphoteric polyelectrolyte which is useful as a paper additive capable of imparting dry strength to paper, a high molecular flocculant, a high molecular dehydrating agent or the like is prepared by copolymerizing a cationic vinyl monomer such as .beta.-methacryloxyethyl trimethylammonium chloride, an anionic vinyl monomer such as acrylic acid and a vinyl monomer such as acrylamide, optionally with a nonionic vinyl monomer such as acrylonitrile, in a solvent in the presence of a catalyst.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: February 17, 1981
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Shigenao Kawakami, Shigeru Ura, Naoyoshi Jinno, Shin-Ichi Isaoka, Wataru Tohoma