Ultrafiltration thin film membranes
CA 1319231 C · Owner: Memtec America Corporation · Inventors: Wrasidlo, Wolfgang J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Mono-layer thin film membranes are provided which are ultraporous. Such mono-layers are formed having a thickness on the order of about 1.2 to 150 nanometers by a, variety of polymerization, cross-linking!! and film treatment processes to achieve the development of controlled pore sizes in the ultraporous size range corresponding to a molecular weight cutoff values of from about 500 to about 1,000,000. Such thin film mono-layer membranes are ordinarily supported on a microporous support material, desirably a microporous polymer membrane having a smooth, microporous skin with pore sizes in the range of from about 0.1 microns to about 3 microns preferably from, about 0.1 microns to about 0.5 …
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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
- Granted June 22, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 22, 2010.
- 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.