Thickening treatment of oil sands tailings including asphaltenes
CA 2850155 C · Owner: Fort Hills Energy L.P. · Inventors: Ringstrom, John Patrick; Hindle, W. Scott; Grant, Chris L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Techniques for treating oil sands tailings containing water mineral solids and bitumen comprising asphaltenes can include the steps of introducing the tailings into a thickener vessel; withdrawing an underflow component from a lower level of the thickener vessel; withdrawing a clarified overflow component from an intermediate level of the thickener vessel; and withdrawing an unclarified overflow component from an upper level of the thickener vessel. The thickener can have a sidewall defining lower intermediate and upper levels of the vessel; a feedwell; an underflow outlet at the lower level; a clarified overflow outlet at the intermediate level; and an unclarified overflow outlet at the …
Read the whole patent
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 January 8, 2004 and granted April 7, 2015. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 8, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 8, 2026.
- 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.