Black trisazo metal complex dyes
CA 2406892 A1 · Owner: Clariant Gmbh · Inventors: Wuzik, Andreas; Geisenberger, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to the metal complexes of tris azo dyes of general formula (4), wherein R1 represents an aryl radical that is mono- or poly-, e.g. 2-, 3-, 4- or 5-fold, substituted with OH O(C1-C6)-alkyl, O(C1-, C6)-alkyl-COOM, O(C1-C6)-alkyl-SO3M O(hydroxy(C1-C6)-alkyl, (C1-C6)-alkyl, COOM SO3M, SO2NH2, SO2N(hydroxy(C1-C6)-alkyl)2 SO2NH(C1-C6)-alkyl, SO2N((C1-, C6)-alkyl)2 NH2, NH(C1-C6)-alkyl, NHacyl, NHaryl, N(hydroxy(C1-C6)-alkyl)2 N((C1-C6)-alkyl)2 and/or halogen; R2 stands for OH O(C1-C6)-alkyl, COOM or , SO3M; R3, R4 and R5 are hydrogen or a substituent; R6 stands for a nonsubstituted or a mono- or poly-substituted mononuclear or binuclear, carbocycli or heterocyclic …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed March 6, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 6, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 6, 2023.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.