Process for oil sands processing
CA 2000068 A1 · Owner: Hall, Frederick T. · Inventors: Hall, Frederick T.; Hall, Frederick T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for the recovery of bitument from the bitumen froth of the hot water extraction process of oil sands which eliminates the diluent centrifugation or other dilution technique of such bitumen froth by subjecting the bitumen froth-aqueous solids mixture to a gravity separation at a temperature of between about 250°F. and about 450°F. and at a pressure sufficient to prevent vaporization of water and bitumen.
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 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2011.
- 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.