Perfluoropolyethers having polycarbonate structure
CA 2212153 A1 · Owner: Danusso, Ferdinando · Inventors: Danusso, Ferdinando; Tonelli, Claudio; Turri, Stefano
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Perfluoropolyethereal compounds having polycarbonate structure, and general formula:, (I) -Rf - CH2O(CH2CH2O) (see fig. I) wherein, c is an integer comprised between 0 and 10 preferably, between 0 and 3, n is an integer from 2 to 1,000 extremes included, Rf is a poly-fluorooxyalkylenic chain having number, average molecular weight (Mn) comprised between 500 and 10,000.
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 31, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 31, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 31, 2019.
- 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.