Method for biological wastewater treatment
CA 2393636 C · Owner: Ingerle, Kurt · Inventors: Ingerle, Kurt
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a method for the biological purification of wastewater by means of activated , sludge. In a system with an aerated activated sludge tank that is permanently hydraulically connected to , at least two sedimentation and recirculation tanks. In the method waste water is introduced into the , aerated activated sludge tank and then the waste water is sequentially introduced into the sedimentation , and recirculation tanks. A plurality of operating cycles are carried out with , each cycle comprising , several phases. In the stirring phase the wastewater is remixed with , activated sludge which is then , allowed to settle during the pre-settling phase and drawing off …
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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 November 30, 2000 and granted April 16, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 30, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 30, 2022.
- 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.