Patents by Inventor Isao Okitaka

Isao Okitaka 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 production of 2,3,4,5-tetrafluorobenzoic acid
    Patent number: 4769492
    Abstract: A method for the production of 2,3,4,5-tetrafluorobenzoic acid, which comprises effecting said production by decarbonating 3,4,5,6-tetrafluorophthalic acid in an aqueous medium adjusted to a pH in the range of 0.7 to 2.2 at a temperature in the range of 100.degree. to 220.degree. C.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: September 6, 1988
    Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.
    Inventors: Osamu Kaieda, Isao Okitaka, Toshiaki Nakamura, Koichi Hirota
  • Method for manufacture or organic fluorine compounds
    Patent number: 4684734
    Abstract: Organic fluorine compounds such as pentafluorobenzonitrile, tetrafluorophthalonitriles, and pentafluoropyridine are produced by a method which comprises causing a chloro- or bromo-organic compound to react with a fluorinating agent such as an alkali metal fluoride in benzonitrile as a solvent at temperatures in the range of 190.degree. to 400.degree. C. under at least spontaneously generated pressure.
    Type: Grant
    Filed: September 13, 1985
    Date of Patent: August 4, 1987
    Assignee: Nippon Shokubai KK Co., Ltd.
    Inventors: Osamu Kaieda, Masaru Awashima, Isao Okitaka, Toshiaki Nakamura
  • 2,3,5,6-Tetrafluorophenyl (meth) acrylates and method for production thereof
    Patent number: 4572805
    Abstract: 2,3,5,6-Tetrafluorophenyl (meth)acrylates represented by the general formula I: ##STR1## wherein R is H or CH.sub.3 and X is H or CN are disclosed. These compounds are obtained by the reaction of 4-cyano-substituted or unsubstituted 2,3,5,6-tetrafluorophenols with (meth)acrylic acid chloride.
    Type: Grant
    Filed: March 5, 1985
    Date of Patent: February 25, 1986
    Assignee: Nippon Shokubai Kagaku Kogyo Co., Ltd.
    Inventors: Osamu Kaieda, Koichi Hirota, Isao Okitaka, Toshiaki Nakamura