Spiral-wound membrane separation device with feed and permeate/sweep fluid flow control
CA 2074168 A1 · Owner: Denslow, Keith · Inventors: Reddy, Damoder; Denslow, Keith
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a spiral-wound membrane module (10) having a semi-permeable membrane (24) which has a central high pressure permeate region (B) flanked on opposite sides by two lower pressure edge portions (A, C). The edge portions (A C), facilitate the dispersion of and the collection of the feed fluid (93) being treated and assist in obtaining a more uniform flow of the feed fluid (93) through the high pressure region (B) of the membrane. In one embodiment, the module (10) has entrance and exit flow means (20, 20A) for a countercurrent flow of a sweep fluid through the permeate. Preferably, the high pressure permeate region (B) is a high density porous spacer flanked on …
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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
- Filed January 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 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.