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:
Feb. 23, 1988
Filed:
Jan. 21, 1986
Applicant:
Inventors:
Fusaji Shoji, Yokohama, JP;
Fumio Kataoka, Yokohama, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562481 ; 502172 ; 502185 ; 502223 ; 502306 ; 502313 ; 502326 ; 502327 ; 502328 ; 560 96 ; 562488 ;
Abstract
When a 4-halogenoorthophthalic acid salt is dissolved together with a base in an alkaline aqueous solution and the solution is heated in the presence of a catalyst comprising a noble metal supported on a carrier, a formic acid salt and a small amount of an aliphatic compound containing a hydroxyl group, a 3,3',4,4'-biphenyltetracarboxylic acid salt is obtained in a high yield.