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:
Jul. 11, 1995
Filed:
Jan. 12, 1993
Applicant:
Inventors:
Tadashi Takemoto, Kawasaki, JP;
Katsumi Sugiyama, Yokkaichi, JP;
Assignee:
Ajinomoto Co., Inc., Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61K / ; C07K / ; C07K / ; C07C / ;
U.S. Cl.
CPC ...
530344 ; 530801 ; 560 40 ; 560 41 ; 562445 ; 562571 ;
Abstract
Mixture containing .alpha.-L-aspartyl-L-phenylalanine methyl ester and 3-benzyl-6-carboxymethyl-2,5-dioxopiperazine are brought into contact with hydrochloric acid in an aqueous solvent to precipitate .alpha.-L-aspartyl-L-phenylalanine methyl ester hydrochloride and 3-benzyl-6-carboxymethyl-2,5-dioxopiperazine, which are then separated from each other by classification.