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. 25, 2000
Filed:
Jul. 07, 1993
Applicant:
Inventors:
Assignee:
Rhodia Chimie, Courbevoie Cedex, FR;
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
549231 ; 549233 ; 549239 ; 549245 ; 549247 ; 549262 ;
Abstract
A process for producing anhydrides by passing a solution of the acid, preferably an organic polyacid, which is to undergo anhydridation over an acidified clay and a process for producing the catalysts therefor.
Alas, Michel. (2000). Process for producing acid anhydrides (U.S. Patent No. 6018057). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/6018057
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