Copolyetherester elastomer
CA 2120126 A1 · Owner: E.I. Du Pont De Nemours And Company · Inventors: Greene, Robin N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thermoplastic segmented, linear copolyetherester elastomer with soft segments derived from poly(alkylene oxide) glycol and hard segments of poly(1,2-ethylene terephthalate) or poly(1,4-butyleneterephthalate) contains very small amounts of certain bifunctional units. Preferred units are derived from trans-1,4-cyclohexylene-bis-(N-trimellitimide) and p-phenylene-bis-(N-trimellitimide). Fibers of the elastomer have non-tacky characteristics and improved elastic properties.
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 October 8, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 8, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 2014.
- 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.