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. 01, 1976
Filed:
Aug. 27, 1974
Applicant:
Inventors:
Karl Linhart, Leverkusen, DT;
Reinold Schmitz, Blecher, DT;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DT;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
260369 ;
Abstract
1-Nitro-anthraquinone is separated from an anthraquinone nitration mixture in concentrated nitric acid by adding to the nitration mixture sulpholan and separating off the insoluble 1-nitro-anthraquinone. The quantity of sulpholan added is such that the mixture contains 10-90% by weight nitric acid and from 90-10% by weight sulpholan.