Polymer membrane for separating mixtures of gases
CA 2380119 A1 · Owner: Blach Vizoso, Ricardo · Inventors: Blach Vizoso, Ricardo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The membrane of the invention comprises asymmetric hollow fiber obtained from , polyethersulfur for pervaporation purposes and treated with mixtures of , liquids (C2H50H+X) wherein X is toluene acetone, dimethylformamide with a , content between 7 and 12 % by volume of the mixture and further treated with , a solution at 2.5 % by volume of urethane siloxane in isopropylic alcohol.
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 August 27, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 27, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 27, 2021.
- 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.