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US 4,408,056 AGranted
Anthraquinone vat dyestuffs
AssigneeBayer Aktiengesellschaft
InventorsWalter Hohmann, Josef Stawitz
Life of this patent
Estimating the term…
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.
Claims2
Nitrotrianthrimidecarbazoles of the formula ##STR6## 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.
Dependencies are inferred from the claim text.