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:
Dec. 28, 1999
Filed:
Dec. 29, 1997
Hans-Albrechl Hasseberg, Grundau, DE;
Hans-Joachim Hasselbach, Gelnhausem, DE;
Klaus Huthmacher, Gelnhausen, DE;
Volker Hafner, Langenselbold, DE;
Harald Heinzel, Frankfurt, DE;
Axel Ronneburg, Hanau, DE;
Degussa Aktiengesellschaft, Frankfurt, DE;
Abstract
A method for obtaining 2-hydroxy-4-methylthiobutyric acid (methionine-hydroxy analog, MHA) in primarily free form which is stable in storage by distilling a product solution containing MHA and by producing MHA product mixtures with improved storage stability from such a distillate. The distillate can be produced directly starting from MHA raw products from any MHA production process, which can optionally also contain solvent or water. The starting material may also be a commercial MHA product.