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:
May. 23, 1989
Filed:
Apr. 07, 1986
Applicant:
Inventors:
Mikio Nakazawa, Uji, JP;
Kango Fujitani, Uji, JP;
Assignee:
New Japan Chemical Co., Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562523 ; 562524 ; 562525 ;
Abstract
Disclosed is a process for preparing a polycarboxylic acid, the process comprising subjecting a Diels-Alder reaction product of maleic anhydride and a diene and/or the corresponding acid to oxidative cleavage using hydrogen peroxide in the presence of at least one catalyst selected from the group consisting of tungstic acid, molybdic acid and heteropoly acids thereof.