The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 15, 1992
Filed:
Mar. 05, 1991
Applicant:
Inventors:
Masayasu Kurono, Nagoya, JP;
Yasuaki Kondo, Nagoya, JP;
Kenji Miura, Nagoya, JP;
Toshinao Usui, Nagoya, JP;
Ryoichi Unno, Nagoya, JP;
Takuji Kakigami, Nagoya, JP;
Kiichi Sawai, Nagoya, JP;
Assignee:
Sanwa Kagaku Kenkyusho Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549402 ;
Abstract
A process for the preparation of optically active 4-oxo-1-benzopyran-2-carboxylic acid derivatives of the formula ##STR1## wherein X and Y are hydrogen atom, halogen atom or alkyl group, and R.sub.1 is hydrogen atom or alkyl group, intermediates thereof, as well as a process for the preparation of the intermediates.