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:
Jul. 21, 1981
Filed:
Oct. 09, 1979
Applicant:
Inventor:
Reinold Schmitz, Odenthal, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07L / ;
U.S. Cl.
CPC ...
260371 ; 260377 ;
Abstract
1,4-Diaminoanthraquinone-2,3-disulphonic acid, which is a valuable dyestuff intermediate product, is obtained in a simple manner when 1,4-diamino-2,3-dichloroanthraquinone is reacted by itself with boric acid, that is to say without the condensation agents which are otherwise customary, such as phenol, sulphuric acid or acetic anhydride, and the reaction product is treated with alkali metal sulphites in a known manner. The new process is more economical and pollutes the environment to a lesser extent than the processes known hitherto.