Method for cleanup of contaminated sandy soils and recovery of hydrocarbons therefrom
CA 2216063 C · Owner: Ignasiak, Teresa · Inventors: Ignasiak, Teresa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for cleanup of the fine fraction (<= 1.0 mm) of sandy soils, contaminated with heavy oil/ bitumen chlorides and heavy metals and for , recovery of heavy oil/ bitumen from aqueous slurries of these soils. The method includes the steps of, screening the sandy soil preparing hot aqueous slurry of prescreened soil screening and, heating the slurry in a slurry heater separating oily froth and contaminated process water, from the slurry of precleaned sandy soil and thickening the precleaned sandy soil in a, separating/thickening vessel followed by reprocessing the thicken slurry of precleaned, sandy soil. Reprocessing generates some additional quantities of residual oily …
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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 19, 1997 and granted December 9, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2019.
- 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
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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.