Patents by Inventor Mitsuharu Yamaji

Mitsuharu Yamaji 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 producing 2,3,5-collidine and/or 2,3,5,6-tetramethylpyridine
    Patent number: 4658032
    Abstract: Process for producing 2,3,5-collidine and/or 2,3,5,6-tetramethylpyridine which is characterized by reacting 3,5-lutidine as the starting material with an aliphatic alcohol having 1 to 4 carbon atoms, in the presence of a catalyst for hydrogenation at a temperature of 200.degree. C. or higher.The above-mentioned 2,3,5-collidine and/or 2,3,5,6-tetramethylpyridine are important compounds as intermediates for synthesizing various pharmaceutical chemicals.
    Type: Grant
    Filed: July 10, 1985
    Date of Patent: April 14, 1987
    Assignee: Koei Chemical Co., Ltd.
    Inventor: Mitsuharu Yamaji