Recovering a sulphur-containing fluid
CA 2021275 C · Owner: Williams, Peter J. · Inventors: Van Laar, Hermanus G.; Williams, Peter J.; Fraser, John E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method of recovering a normally gaseous fluid containing sulphur compounds and elemental sulphur from an underground reservoir (5), which method comprises constructing a well (3) extending to the underground reservoir (5) and arranging in the well (4) an open-ended tubing (12) extending to surface which tubing (12) is provided at its lower end with an annular seal (13) and with three inlet conduits (15, 25 and 26) allowing fluid flow from outside the tubing (12) to inside the tubing (12) which inlet conduits (15 25, and 26) are located between the annular seal (13) and the surface allowing reservoir fluid to enter into the lower end of the tubing (12), supplying gas to the inlet openings of …
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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 July 16, 1990 and granted November 20, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 16, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 16, 2012.
- 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.