Combined steam and vapor extraction process (savex) for in situ bitumen and heavy oil production
CA 2325777 C · Owner: Okazawa, Tadahiro · Inventors: Myers, Ron D.; Gutek, Harold; Okazawa, Tadahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for recovery of hydrocarbons from an underground reservoir of said hydrocarbons the underground reservoir being penetrated by an injection well and a production well spaced from the injection well the process comprising: (a) injecting steam into said reservoir thereby heating said reservoir to mobilize and recover at least a fraction of said hydrocarbons and to form a chamber in said reservoir; and then (b) continuing to inject steam into said reservoir and mobilize and recover hydrocarbons therefrom until at least one of (i) an upper surface of said chamber has progressed vertically to a position that is approximately 25 to 75% preferably 40 to 60%, or about 50% the distance from …
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 November 10, 2000 and granted May 27, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 10, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 10, 2022.
- 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.