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:
May. 11, 1993
Filed:
May. 24, 1991
Applicant:
Inventors:
Skippy H Ramsey, Fenton, MO (US);
Robert G Schultz, St. Louis, MO (US);
Assignee:
Monsanto Company, St. Louis, MO (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562582 ;
Abstract
There is disclosed a process for the hydration of an acid selected from the group consisting of maleic acid, fumaric acid, sodium hydrogen maleate and mixtures thereof to malic acid in an aqueous reaction mixture in excellent yields and with particularly high purity by performing the synthesis in the presence of sodium ions in the molar ratio of sodium ions to acid or salt thereof in the range of from 0.2 to about 0.5.