Water-soluble yellow azo dyes
CA 2475624 A1 · Owner: Wuzik, Andreas · Inventors: Wuzik, Andreas; Menzel, Heidemarie; Geisenberger, Josef
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a dye of formula (2) where A and B together or , independently = a C6-C10 aryl group optionally substituted with 1, 2, 3 or 4 substituents from C1-C6 alkyl, hydroxy C1-C6 alkoxy, carboxy, sulpho, sulphonamido amino and C1-C6 alkylamino, or a 5- to 7-membered aromatic heterocycle which may be benzoannellated and can have 1 2, 3 or 4 of the , above substituents, or A = an azo dye group of formula (2a) D1-N=N-D2- (2a) where D1 and D2 together or independently = a C6-C10 aryl group optionally , substituted with 1, 2, 3 or 4 substituents from C1-C6 alkyl hydroxy, C1-C6 , alkoxy, carboxy, sulpho sulphonamido, amino and C1-C6 alkylamino Y = an , oxygen- and/or …
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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 3, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 3, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 3, 2025.
- 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.