Pyridone dyes, a process for their preparation and their use in the production of coloured plastics or polymeric colour particles
CA 2434837 A1 · Owner: Ciba Specialty Chemicals Holding Inc. · Inventors: Tzikas, Athanassios; Dreier, Romeo; Lauk, Urs
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 pyrifone azo dyes of formula (1) wherein A , is the radical of a diazo component of the benzene naphthalene, diphenyl, azobenzene, thiophene benzothiazole, benzoisothiazole, thiadiazole indazole, benzotriazole, pyrazole, anthraquinone naphttholic acid imide, chromone, phthalimide or diphenylene oxide series R1 is hydrogen, unsubstituted or , hydroxyl- or phenyl- substituted C1-C6alkyl it being possible for the alkyl , chain to be interrupted from C3 upwards by one or more oxygen atoms or has , the meanings of R2, R2 is a radical of formulae (2) (3), (4), (5), (6), or , (7), wherein B is a bridging member R4 is alkyl or aryl, R5 and R6 are each independently …
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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 February 28, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 28, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 28, 2024.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.