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:
May. 28, 1985
Filed:
Nov. 29, 1982
Applicant:
Inventor:
Josef Stawitz, Cologne, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07D / ;
U.S. Cl.
CPC ...
548416 ;
Abstract
Process for preparing 4,4'-dibenzoylaminoanthrimidecarbazole, characterized in that 4,4'-diaminodianthrimide is benzoylated and carbazolated, both steps being carried out in one-vessel fashion and the 4,4'-diaminodianthrimide having been obtained by oxidizing a mixture of 1-aminoanthraquinone and 1,4-diaminoanthraquinone in a molar ratio of 0.9:1 to 1.4:1 in 30 to 60% strength H.sub.2 SO.sub.4 and then reducing.