Hollow fibres of modified poly-(2,6-dimethyl-p-oxyphenylene)
CA 2070967 A1 · Owner: Stopponi, Alessandro · Inventors: Valentini, Claudio; Sisto, Raffaello; Pedretti, Ugo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
CASE 3418, HOLLOW FIBRES OF MODIFIED POLY-(2,6-DIMETHYL-p-OXY-PHENYLENE) Abstract, A hollow fiber of amorphous, hydroxy-ethylated poly-(2,6-dimethyl-p-oxyphenylene) (PPO-OH) with a glass transition temperature (Tg) of from 180 to 200°C is disclosed which is formed by a high-density, microporous layer on a macroporous backing, and having an outer diameter comprised within the range of from 450 to 550 µm and an inner diameter comprised within the range of from 250 to 400 µm. The process for preparing the hollow fibre and the use of said fibre in the processes of separation of gas mixtures are disclosed as well.
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 June 10, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 10, 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.