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. 04, 1985
Filed:
Mar. 16, 1984
Applicant:
Inventors:
Friedrich W Krock, Cologne, DE;
Rutger Neoff, Leverkusen, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260371 ;
Abstract
1,4-Diamino-anthraquinone-2-sulphonic acid is obtained in a simple manner, in good yield and good purity, by reacting 1-amino-4-bromo-anthraquinone-2-sulphonic acid with ammonia in water in the presence of copper catalysts at an elevated temperature, under a partial pressure of ammonia of at least 5 bar.