Concentration of solids in a suspension using hollow fibre membranes
CA 2114228 C · Owner: Doig, Ian Dracup · Inventors: Darzi, Jalil Michel; Doig, Ian Dracup; Kopp, Virgil Clinton
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A microporous filter assembly is disclosed which in some modes of operation, has feed pressure fed to the external walls of the microporous fibres (13) comprising the filter. In other forms feed is caused to move across the walls of the fibres (13) by the application of a lowered pressure to the lumens of the fibres (13). Various forms of backwashing of the fibres (13) are disclosed with none of the modes requiring a prepressurisation step of the environment within and around the fibres (13) prior to commencement of backwash. In particular forms of backwash initial steps of the , backwash include terminating supply of feed to the exterior surface of the fibres (13) and substantially …
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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 August 7, 1992 and granted July 2, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 2014.
- 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.