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. 13, 1993
Filed:
Sep. 30, 1991
Applicant:
Inventors:
Tadao Tateba, Hofu, JP;
Michio Shiomi, Hofu, JP;
Assignee:
Kyowa Hakko Kogyo Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C30B / ;
U.S. Cl.
CPC ...
156621 ; 156600 ; 156D / ; 156D / ; 562562 ; 564477 ;
Abstract
Disclosed is a process for producing crystals of a salt of an acidic amino acid and a basic amino acid, which comprises adding a water-miscible solvent to an aqueous solution of the salt to prepare a solution 90% or more saturated or supersaturated with the salt, heating the resultant solution under reflux until the formation of crystals stops, adding gradually a water-miscible solvent to the solution under reflux to form crystals of the salt, and recovering the crystals from the resultant mixture.