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. 19, 1999
Filed:
Jul. 31, 1996
Applicant:
Inventors:
Hideaki Ohtaki, Tokyo, JP;
Hitoshi Koike, Tokyo, JP;
Assignee:
Yuki Gosei Kogyo Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B01D / ;
U.S. Cl.
CPC ...
203 48 ;
Abstract
A method of purifying 1,3-bis(3-aminopropyl)-1,1,3,3-tetraorganodisiloxane represented by the formula (I) as described hereinbefore, which comprises recrystallizing a crude product of the compound as its acid addition salt, and then neutralizing the acid addition salt to obtain a purified product of the compound. According to the method of the present invention, the compound of the formula (I) can be purified at high purity in high yield, and the purification treatment can be industrially conducted.