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:
Jan. 05, 1982
Filed:
Mar. 13, 1978
Tanabe Seiyaku Co., Ltd., Osaka, JP;
Abstract
Seed crystals of an optically active enantiomer of any one of p-hydroxyphenylglycine benzenesulfonate, p-hydroxyphenylglycine p-ethylbenzenesulfonate, p-hydroxyphenylglycine o-toluenesulfonate or p-hydroxyphenylglycine sulfosalicylate are added to a supersaturated solution of the racemic modification of the corresponding p-hydroxyphenylglycine salt. Crystallization of the optically active enantiomer results. Then, the crystals are recovered. Alternatively, crystals of the optically active enantiomer may be added to a hot solution of the racemic modification of the corresponding p-hydroxyphenylglycine salt to produce a supersaturated solution thereof. The solution is then cooled to crystallize out the optically active enantiomer. Optically active p-hydroxyphenylglycine benzenesulfonate, optically active p-hydroxyphenylglycine p-ethylbenzenesulfonate, optically active p-hydroxyphenylglycine o-toluenesulfonate or optically active p-hydroxyphenylglycine sulfosalicylate is thereby obtained.