Patents by Inventor Suketoshi Tsukamoto

Suketoshi Tsukamoto 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 producing purified epoxy compound
    Patent number: 5892065
    Abstract: A 2,3-epoxypropyl derivative or a 2-methyl-2,3-epoxypropyl derivative of a compound having carboxyl groups or amido groups is produced as a purified product having an epoxide equivalent of 1.0 to 1.1 times the theoretical epoxide equivalent of the derivative, an ionic halogen content of 10 ppm or less, transparency when molten and a stability against increase in the epoxide equivalent when stored at 150.degree. C. for 24 hours, by a process comprising steps (A) reacting 1.
    Type: Grant
    Filed: July 14, 1997
    Date of Patent: April 6, 1999
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Suketoshi Tsukamoto, Takami Ono, Hisao Ikeda, Motohiko Hidaka
  • Method of purifying .alpha.-substituted acetic acids
    Patent number: 4970336
    Abstract: This invention relates to methods of preparing and purifying .alpha.-substituted acetic acids, which comprise treating an .alpha.aromatic-substituted acetic acid represented by a specific general formula with a weak alkali while shielding light, or subjecting an .alpha.-aromatic-substituted acetonitrile represented by a specific general formula to acid hydrolysis, followed by treatment with a weak alkali while shielding light; and treating the alkali salt of .alpha.-substituted acetic acid thus formed with a decolorizing agent.
    Type: Grant
    Filed: May 31, 1989
    Date of Patent: November 13, 1990
    Assignee: Nissan Chemical Industries, Ltd.
    Inventors: Yoshikazu Yoshioka, Isao Hashiba, Suketoshi Tsukamoto