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:
Dec. 26, 1978
Filed:
May. 09, 1977
Applicant:
Inventor:
Hiroshi Uchiyama, Hirakata, JP;
Assignees:
E. C. Chemical Ind. Co., Ltd., BOTH OF, JP;
C. Itoh & Co., BOTH OF, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ; C07D / ;
U.S. Cl.
CPC ...
2603407 ; 2603 / ;
Abstract
Purified dibenzylidene sorbitol is prepared by mixing crude dibenzylidene sorbitol containing monobenzylidene sorbitol and tribenzylidene sorbitol as by-product impurities with a lower aliphatic alcohol to dissolve the impurities, and separating and recovering the undissolved dibenzylidene sorbitol. This process affords dibenzylidene sorbitol having a purity of at least 98% from crude dibenzylidene sorbitol with a purity of about 95%.