Imidazolyl derivatives, their use as curing agents in epoxy-resin compositions, and curable epoxy-resin compositions and molded epoxy-resin articles incorporating said imidazolyl derivatives
CA 2025323 A1 · Owner: Schering Aktiengesellschaft · Inventors: Burba, Christian; Mrotzek, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to new imidazolyl derivatives their use as curing agents in epoxy-resin compositions and cur-, able epoxy-resin compositions containing them and composed of an epoxy resin and compounds of the general formula (I), where R is the group of the alcohol component used to produce the glycidyl ethers, R1 and R2 are, independently of each other hy-, drogen, -CH3 or -C2H5, n is 2 or 3 R3 is COOH, -CN, -CONH-NH2, -COOCH2-CH2-OH or COOR4 R4 being an aliphatic hydrocarbon group having from 1 to 4 carbon atoms, and m is equal to the valence of R. schering\2495.pat
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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 September 13, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 13, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 13, 2012.
- 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.