Copolyetherester elastomer with cycloaliphatic hard segments
CA 2043922 A1 · Owner: E. I. Du Pont De Nemours And Company · Inventors: Figuly, Garret D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Copolyetherester Elastomer, with Cycloaliphatic Hard Segments ABSTRACT OF THE DISCLOSURE, An improved thermoplastic segmented, linear, copolyetherester elastomer having hard segments derived from diols and diacids which provide divalent cycloaliphatic radicals having a structure depicted by a formula which is, , and/or , . Preferably the diol and diacid radicals are each at least 40% trans isomer and either one or the other radical is at least 70% trans isomer. The elastomers are suited for use as rubber-band substitutes, elastic strips elastic, coatings and the like. 23
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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 June 5, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 5, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 5, 2013.
- 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.