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:
Oct. 04, 1983
Filed:
Dec. 29, 1982
Applicant:
Inventors:
Walter Hohmann, Leverkusen, DE;
Josef Stawitz, Cologne, DE;
Assignee:
Bayer Aktiengesellschaft, Leverkusen, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09B / ;
U.S. Cl.
CPC ...
548416 ;
Abstract
Nitrotrianthrimidecarbazoles of the formula ##STR1## in which the NO.sub.2 group is in the .alpha.- or .beta.-position and R.sub.1, r.sub.2 ; R.sub.3 and R.sub.4 designate hydrogen or halogen such as chlorine and bromine, their use as vat dyestuffs, a process for their preparation, and the use, as vat dyestuffs, of compounds which in the formula (I) have an NH.sub.2 group in place of the NO.sub.2 group.