Linear phosphine-borane polymers and methods of preparation therefor
CA 2302181 A1 · Owner: Dorn, Hendrick · Inventors: Manners, Ian; Dorn, Hendrick
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Linear backbone phosphorus-boron polymers of the general formula (I): wherein R1, R2, R3, and R4, are the same or different and selected from H optionally, substituted alkyl, alkenyl and phenyl; and n is at least 2 and particularly , high, molecular weight polymers of number average molecular weight of at least 5,000. The polymers are of use as fire retardants.
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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 March 24, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 24, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 24, 2022.
- 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.