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:
Jun. 28, 1977
Filed:
Sep. 24, 1975
Applicant:
Inventors:
Hans-Juergen Quadbeck-Seeger, Ludwigshafen, DT;
Helmut Hoch, Ludwigshafen, DT;
Assignee:
BASF Aktiengesellschaft, Ludwigshafen (Rhine), DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
2605 / ;
Abstract
2-HYDROXYNAPHTHALENE-3-CARBOXYLIC ACID IS PRODUCED BY HEATING A MIXTURE OF POTASSIUM .beta.-NAPHTHOLATE AND SODIUM .beta.-NAPHTHOLATE TO A TEMPERATURE OF AT LEAST 180.degree. C, reacting it with carbon dioxide and treating the salt formed with an acid. The product is a dye intermediate, a coupling component of surface coating dyes and chrome dyes, and a developer for diazo dyes.