Patents by Inventor Shouzo Shimada

Shouzo Shimada 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 pyridine-2,3-dicarboxylic acid compounds
    Patent number: 4973695
    Abstract: A process for preparing pyridine-2,3-dicarboxylic acid compounds of the following formula: ##STR1## wherein R.sup.1 and R.sup.3 are, identical or different, each a hydrogen atom or a lower alkyl group, R.sup.2 is a hydrogen atom, a lower alkyl group, or a phenyl-(lower)alkyl group which may have halogen atom or lower alkyl group on its phenyl ring, and R.sup.4 and R.sup.5 are, identical or different, each a lower alkoxy group.The compounds are useful as an intermediate for preparing agricultural chemicals and pharmaceuticals.
    Type: Grant
    Filed: February 10, 1989
    Date of Patent: November 27, 1990
    Assignee: Sugai Chemical Ind. Co., Ltd.
    Inventors: Takaharu Yamashita, Mitsuhiro Kodama, Shouzo Shimada