Fibre reactive azo dyes
CA 2434825 A1 · Owner: Dystar Textilfarben Gmbh & Co. Deutschland Kg · Inventors: Russ, Werner; Ebenezer, Warren James
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention refers to dyestuffs of the formula I (see formula I), wherein, each of R1, R2 R3, R4 and R5, independently, is H or an optionally substituted, alkyl group;, each of X1 and X2 independently, is a labile atom or group; each of x and y, independently, is 0 or 1 and at least one of x and y is 1; each of a and b is 2 to 5 and when each of x and y is 1 a > b; and, z is 0, 1, 2, 3 or 4; and, wherein the variables D1 and D2 are defined as given in claim 1 processes far, their preparation and their use for dyeing and printing hydroxy- and/or carboxamido-containing fiber materials.
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 July 9, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 9, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 9, 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.