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. 04, 1997
Filed:
Feb. 01, 1995
Applicant:
Inventors:
Toshio Nakamatsu, Hyogo, JP;
Yasuhiro Nishida, Hyogo, JP;
Shinichi Watanabe, Kyoto, JP;
Norio Kometani, Osaka, JP;
Assignees:
Sumitomo Chemical Company, Limited, Osaka, JP;
Sumika Fine Chemicals Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
562425 ;
Abstract
A method for producing 1,4-dihydroxy-2-naphthoic acid which comprises the steps of: subjecting 1,4-dihydroxynaphthalene into an alkali metal salt formation reaction in an organic medium capable of dissolving 1,4-dihydroxynaphthalene using an alkali metal alcoholate; and subjecting the salt formation reaction mixture to carboxylation using carbon dioxide gas.