Patents by Inventor Kenji Nishio

Kenji Nishio 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 preparation of 3,4,5,6- tetrahydrophthalimide
    Patent number: 5155231
    Abstract: Disclosed is a process for preparing 3,4,5,6-tetrahydrophthalimide comprising the steps of:(i) reacting a crude 3,4,5,6-tetrahydrophthalic anhydride containing as impurities at least one carboxylic anhydride (A) selected from the group consisting of phthalic anhydride, hexahydrophthalic anhydride and structural isomers of 3,4,5,6-tetrahydrophtalic anhydride with an alcohol for conversion of substantially all the carboxylic anhydride (A) into the monoester thereof to obtain a reaction mixture containing the monoester, 3,4,5,6-tetrahydrophthalic anhydride, and if any, a monoester of 3,4,5,6-tetrahydrophthalic anhydride, and(ii) adding ammonia to the reaction mixture to subject the 3,4,5,6-tetrahydrophthalic anhydride, and if any, the monoester thereof to a reaction for conversion into 3,4,5,6-tetrahydrophthalimide.
    Type: Grant
    Filed: October 29, 1990
    Date of Patent: October 13, 1992
    Assignee: New Japan Chemical Co., Ltd
    Inventors: Kenji Nishio, Shoji Tani
  • Process for preparing 3,4,5,6-tetrahydrophthalic anhydrides or derivatives thereof
    Patent number: 4273719
    Abstract: .DELTA..sup.1 -THPA or a derivative thereof is prepared by isomerizing .DELTA..sup.4 -THPA or a derivative thereof in the presence of (a) a palladium catalyst, and (b) an inorganic salt and/or a sulfur compound.
    Type: Grant
    Filed: November 21, 1979
    Date of Patent: June 16, 1981
    Assignee: New Japan Chemical Company, Ltd.
    Inventors: Shoji Tani, Kenji Nishio