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. 04, 1976
Filed:
Feb. 11, 1974
Applicant:
Inventors:
Gentaro Yamashita, Iwakuni, JA;
Yasushi Tsuru, Matsuyama, JA;
Kiyoshi Yamamoto, Iwakuni, JA;
Moriharu Yamamoto, Matsuyama, JA;
Nobuo Sakaiya, Matsuyama, JA;
Toshihiro Aoyama, Matsuyama, JA;
Tadao Komoriya, Iwakuni, JA;
Assignee:
Teijin Ltd., Osaka, JA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ; C07C / ;
U.S. Cl.
CPC ...
2604 / ; 2604299 ; 2604 / ; 2605 / ; 260525 ;
Abstract
A novel 1,3,5,7-naphthalenetetracarboxylic acid, an alkali salt thereof, or an ester thereof, and a novel process for preparation thereof, and method of effective purification thereof.