System for purification of phosphate-containing sewage
CA 1324844 C · Owner: Linde Aktiengesellschaft · Inventors: Schoenberger, Rainer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
SYSTEM FOR PURIFICATION OF PHOSPHATE-CONTAINING SEWAGE" Abstract of the Disclosure, For improvement of the phosphate redissolution taking place under anaerobic conditions the treatment, is conducted under anaerobic conditions preferably in a, settling tank, into which unsettled raw sewage and a return sludge from the secondary settling tank are introduced. The sludge retention time of the return sludge is generally over 5 hours, preferably 10-24 hours. In any case, the sludge detection time exceeds the hydraulic detection time. The new process can be performed by using most existing plants with relative small investment expenditures and provides a phosphorus elimination on the order of …
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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 30, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 30, 2010.
- 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.