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:
Jan. 06, 1976
Filed:
Nov. 16, 1973
Applicant:
Inventors:
Wolfgang Auge, Odenthal, DT;
Bernd Thelen, Leverkusen, DT;
Karl-Werner Thiem, Cologne, DT;
Rutger Neeff, Leverkusen, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen-Bayerwerk, DT;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260369 ;
Abstract
Process for the manufacture of pure 1-nitroanthraquinone, characterised in that a nitroanthraquinone mixture obtained by nitration of anthraquinone in the presence of inorganic acids and, optionally, lowering the molar fraction of the acids in the reaction mixture after isolation of the reaction products which have precipitated and, optionally, further measures, is subjected to a rectification.