Method and a system for treating liquid, in particular waste water
CA 1113193 A · Owner: Pielkenrood-Vinitex B.V. · Inventors: Pielkenrood, Jacob
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is directed to a method and system for treating liquids, in particular waste water by using an aerobic purification, characterized in that the liquid under treatment, preliminary to the biological purification, is submitted to a physicochemical pretreatment with flotation by using finely divided gas bubbles, and in that the surplus sludge of the biological purification is recycled towards the physico-chemical treatment stage, this in such a manner that the removed floating layer obtained in this physicochemical treatment is the only separation product.
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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
- Granted November 24, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 24, 1998.
- 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.