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:
Apr. 16, 1991
Filed:
Aug. 31, 1989
Applicant:
Inventor:
Ulrich Eichenauer, Frankfurt am Main, DE;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen, DE;
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
568730 ; 568717 ; 568722 ;
Abstract
4,4'-Dihydroxyterphenyl is prepared by sulfonating terphenyl with sulfuric acid, sulfur trioxide, a mixture thereof or chlorosulfonic acid and then treating the resulting terphenyl-4,4'-disulfonic acid, which may be first converted into a dialkali metal salt, with an alkali metal hydroxide.
Eichenauer, Ulrich. (1991). Preparation of 4,4'-dihydroxyterphenyl (U.S. Patent No. 5008472). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/5008472
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile