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. 08, 1981
Filed:
Dec. 02, 1980
Ryuichi Mita, Kawasaki, JP;
Chojiro Higuchi, Kamakura, JP;
Toshio Kato, Kawasaki, JP;
Nobuyuki Kawashima, Kamakura, JP;
Akihiro Yamaguchi, Kamakura, JP;
Shosuke Nagai, Yokohama, JP;
Takao Takano, Fujisawa, JP;
Mitsui Toatsu Chemicals, Inc., Tokyo, JP;
Abstract
Production of DL-serine by heating a strong acid type cation exchange resin having aziridine-2-carboxylic acid absorbed thereto. Specifically, an industrial process for producing DL-serine is provided which comprises treating an alpha-halogeno-beta-aminopropionitrile or its mineral acid salt in water or a water-containing organic solvent with an alkali or alkaline earth metal hydroxide to form an alkali or alkaline earth metal aziridine-2-carboxylate, treating the reaction mixture with a strong acid type cation exchange resin to cause adsorption of aziridine-2-carboxylic acid, and thereafter heating the cation-exchange resin.