Reactive azo dyes, preparation thereof and use thereof
CA 2419973 A1 · Owner: Meier, Stefan · Inventors: Worner, Jorg; Russ, Werner; Meier, Stefan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to reactive azo dyes of general formula (1) wherein Y , represents a heterocyclic reactive group of general formula (2) or (3) wherein X1 - X5 are defined as cited in Claim 1. The invention also relates to a method for the production thereof and the use thereof to dye and print material containing hydroxyl and/or carbonamide groups.
Read the whole patent
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 August 11, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 11, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 11, 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.