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:
Aug. 29, 1989
Filed:
Jul. 06, 1988
Applicant:
Inventors:
Takahiro Haga, Kusatsu, JP;
Itaru Shigehara, Kusatsu, JP;
Toru Koyanagi, Kusatsu, JP;
Kazutoshi Hara, Kusatsu, JP;
Masaru Maeda, Kusatsu, JP;
Assignee:
Ishahara Sangyo Kaisha Ltd, Osaka, JP;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
546 16 ;
Abstract
A method for isomerization of trans-form 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine or acid addition salts thereof, which comprises isomerizing said trans-form quinuclidine or acid addition salts thereof to cis-form 2-methylspiro(1,3-oxathiolane-5,3')quinuclidine or acid addition salts thereof in the presence of at least one acid catalyst selected from the group consisting of an organic sulfuric acid, a halide functioning as a Lewis acid, and sulfuric acid.