Water clarifier with first filtrate isolation, improved backwashing and improved bubble generation
CA 2136200 C · Owner: Krofta, Milos · Inventors: Krofta, Milos
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A clarifier (10) with first stage flotation and second stage filtration divides at least the lower portion of a flotation tank (12) into independent cells (54). A branched conduit (78) collects clarified water. Valves (76) control the flow of clarified water to either a clarified water ring conduit (62) or to a first filtrate/bachwash ring conduit (64) connected to a storage tank (68). High cell walls (53) and inclined baffles (58) retain filter media during backwashing. A decompression valve (94) for pressurized water with dissolved air has a narrow annular slot set by a moveable member to create microscopic air bubbles. A mechanical or pneumatic actuator periodically opens the slot to …
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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 May 17, 1993 and granted June 15, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2015.
- 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.