Oil sands tailings treatment process
CA 2188064 C · Owner: Ozum, Baki · Inventors: Ozum, Baki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Fresh hot tailings, from the hot water extraction process for removing bitumen from oil sand are treated to remove fine clay solids ("fines") in the suspension. Ca(OH)2 lime is added to the suspension to reduce the stability of the clay-water colloidal structure. Then CO2 is injected to react with excess Ca++ and form water-insoluble CaCO3. The CaCO3 adsorbs fines and sediments them.
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 October 17, 1996 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 17, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 17, 2018.
- 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.