Membrane module
CA 2090855 A1 · Owner: Kaschemekat, Jurgen · Inventors: Baker, Richard William; Wijmans, Johannes G.; Kaschemekat, Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A spiral-wound pervaporation module incorporating membrane, envelopes (2), within and between which are channels through which the feed and permeate streams flow. The feed and permeate channels are created by feed spacers (3) and permeate spacers (4). The module is unconventional in that the permeate spacer is tailored for optimum permeate flow throughput, based on the discovery that the total permeate flow throughput passes through a maximum as the resistance to vapor transport of the permeate spacer material is progressively decreased. The resistance to vapor transport along the permeate channel is kept below a value at which it has a significant adverse effect on the membrane flux and …
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 September 10, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 10, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 10, 2013.
- 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.