Composite diaphragm, process for producing it and its use
CA 2072016 A1 · Owner: Hoechst Aktiengesellschaft · Inventors: Prass, Werner; Haubs, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure HOE 89/F 406K Composite membrane, process for its production and its use, A composite membrane for gas separation having a threelayer structure, constructed from, A) a supporting membrane layer made of porous polymer B) a nonporous, gas-permeable intermediate layer C) a permselective layer of regularly arranged organic molecules having a layer thickness of 3 to 100 nm the layers (A) and (C) enclosinq the intermediate layer (B), wherein the permselective layer (C) is constructed from regularly arranged amphiphilic molecules which contain one or two alkyl chains each having 7 to 25 carbon atoms per polar hydrophilic group.
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 November 26, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 26, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 26, 2012.
- 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.