Process for clarifying milkhouse wastewater
CA 2192309 C · Owner: Kollaard, William · Inventors: Malcolm, Ian; Kollaard, William; Weil, Claude
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and apparatus are described for clarifying milkhouse wastewater which is rich in phosphorous and also contains colloïdal and suspended solids. This wastewater is obtained during the washing of milk pipelines of a diary milking system. The wastewater is collected in a treatment vessel with the , ratio of suspended solids to phosphorus in the wastewater being lowered either before entering or while in the treatment vessel. To this wastewater of lowered suspended solids:phosphorus ratio there is added sufficient calcium, preferably in the form of lime to react with all of the phosphorus in the wastewater to form calcium hydroxyapatite precipitate. It has been discovered that, …
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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 March 31, 1995 and granted November 6, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 31, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 31, 2017.
- 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.