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:
Feb. 01, 1983
Filed:
Feb. 03, 1981
Applicant:
Inventors:
Assignee:
Sogo Pharmaceutical Co. Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07F / ; C07C / ;
U.S. Cl.
CPC ...
2604 / ; 260944 ; 260978 ;
Abstract
A process for preparing a cysteamine-S-substituted compound involves reacting ethyleneimine or ethyleneimine derivatives with a thiosulfate or thiophosphate in the presence of a cation exchanger of a free type. Use of the cation exchanger of a free type in this reaction allows preparation of the cysteamine-S-substituted compound with an amazingly high purity in a high yield.