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. 10, 2001
Filed:
May. 20, 1999
Applicant:
Inventors:
Karl-Heinz Giselbrecht, Pasching, AT;
Josef Schaller, Linz, AT;
Assignee:
DSM Fine Chemicals Austria Nfg GmbH & CoKG, Linz, AT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C12P 1/320 ;
U.S. Cl.
CPC ...
C12P 1/320 ;
Abstract
An improved process for preparing L-aspartic acid by enzyme-catalyzed reaction of fumaric acid with ammonia, in which process L-aspartic acid is precipitated out by nitric acid and the resultant mother liquor is subjected to a nanofiltration.