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. 17, 1976
Filed:
Nov. 30, 1973
Applicant:
Inventor:
Axel Vogel, Cologne, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260369 ;
Abstract
Process for the preparation of 1-nitroanthraquinone which is practically free of 1,5-dinitroanthraquinone from 1-nitroanthraquinone containing 1,5-dinitroanthraquinone, characterised in that 1-nitroanthraquinone containing 1,5-dinitroanthraquinone is treated with a mixture of concentrated nitric acid and an inert organic solvent, the undissolved constituent is separated off and the 1-nitroanthraquinone is isolated from the solution.