Patents by Inventor Gengiro Kawamura

Gengiro Kawamura 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 inhibiting the degradation of an aqueous solution of an acrylamide polymer in a petroleum recovery process
    Patent number: 4481316
    Abstract: 2-Mercaptobenzoimidazole or its water-soluble salt is added to a water-soluble acrylamide polymer containing a predominant amount of acrylamide in the molecule to inhibit degradation, especially at high temperatures, in a petroleum recovery process.
    Type: Grant
    Filed: December 22, 1982
    Date of Patent: November 6, 1984
    Assignee: Nitto Chemical Industry Co., Ltd.
    Inventors: Shoichi Kanda, Gengiro Kawamura
  • Method for stabilizing an acrylamide polymer in a petroleum recovery process
    Patent number: 4393163
    Abstract: 2-Mercaptobenzoimidazole or its water-soluble salt is added to a water-soluble acrylamide polymer containing a predominant amount of acrylamide in the molecule to inhibit degradation, especially at high temperatures, in a petroleum recovery process.
    Type: Grant
    Filed: December 10, 1979
    Date of Patent: July 12, 1983
    Assignee: Nitto Chemical Industry, Co., Ltd.
    Inventors: Shoichi Kanda, Gengiro Kawamura