Patents by Inventor Tetsuo Tomita

Tetsuo Tomita 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).

  • Process for preparing polyphenylene oxides
    Patent number: 4067851
    Abstract: Polyphenylene oxides, self-condensation products of phenols, are prepared with a high yield through oxidative coupling by employing a catalyst system with higher activity, which comprises a copper compound, iodine or an iodine-containing compound and a primary amine.
    Type: Grant
    Filed: December 9, 1975
    Date of Patent: January 10, 1978
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Tetsuo Tomita, Tadashi Yoshii, Akira Ito
  • Process for producing polyphenylene oxides
    Patent number: 3989671
    Abstract: Polyphenylene oxides, self-condensation products of phenols, are produced through oxidative coupling by employing a novel catalyst system which comprises a copper compound, an iodine compound and tertiary diamine which is capable of forming a stable chelate ring with the copper compound.According to this invention, copper compounds, which hitherto have been considered to be unsuitable for using with tertiary amines, act with excellent performance as a component of the catalyst.
    Type: Grant
    Filed: February 22, 1974
    Date of Patent: November 2, 1976
    Assignee: Mitsubishi Gas Chemical Company, Inc.
    Inventors: Eiichi Yonemitsu, Akitoshi Sugio, Tetsuo Tomita, Tadashi Yoshii, Akira Ito