Method for heating hydrocarbon contaminated soils and removal of volatile hydrocarbons
CA 2206949 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
An improved method for heating the aqueous slurries of soils contaminated with tarry/oily organics and volatile compounds. The method includes the steps of heating the, slurry (containing inorganic and carbonaceous solids below 1/8 inch) with atmospheric, pressure steam in a specially designed slurry heater(s) contacting the hot , (95-99°C), slurry with the contaminated feed soil (top size 5 inch) in a hydraulic feeder, processing, the resultant slurry in a tumbler at temperatures up to 90°C separating the -1/8 inch, solids from the slurry exiting the tumbler and recycling a portion of the -1/8 inch solids in, slurry back to slurry heater(s). In order to reach the required temperature …
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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 June 17, 1997 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 17, 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
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.