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:
Mar. 29, 1988
Filed:
Sep. 24, 1984
Applicant:
Inventor:
Fritz Schindler, Gelsenkirchen, DE;
Assignee:
Huels Aktiengesellschaft, Marl, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C12P / ; C12R / ; C12R / ; C12R / ;
U.S. Cl.
CPC ...
435145 ; 435911 ; 435914 ; 435920 ; 435929 ; 435932 ; 435933 ;
Abstract
L-malic acid is produced in a concentration of 170 to 400 g per liter and high yield by biotechnical conversion of fumaric acid neutralized with ammonium hydroxide in nutrient-free solution or suspension. Pure L-malic acid can be obtained economically therefrom with high efficiency in a quality suitable for food and pharmaceutical use. The fermentation can be carried out in simple vessels under non-sterile conditions. The conversion rate of the fumarate and the attainable concentration of L-malate are promoted by the ammonium ions.