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:
Jul. 22, 1997
Filed:
May. 26, 1995
Applicant:
Inventor:
Lars-Gunnar Larsson, Holo, SE;
Assignee:
Astra Aktiebolag, Sodertalje, SE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549404 ; 558354 ;
Abstract
A process for preparing (R)-3-amino-5-methoxychroman is provided. The process comprises the steps of (i) dissolving racemic 3-amino-5-methoxychroman and L(+)tartaric acid in water to form the tartrate salt; (ii) heating the solution until a clear solution is obtained; and (iii) crystallizing the tartrate salt by allowing the solution to cool to room temperature.