Removing hydrogen sulphide from a gas mixture
CA 2006093 C · Owner: Christy, John Graham · Inventors: Christy, John Graham
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Removing hydrogen sulphide from a gas mixture comprises contacting in absorber (3) the gas mixture with absorbent to obtain loaded absorbent; introducing loaded absorbent into separation vessel (13) at a reduced pressure to obtain flash-off gas and partially regenerated absorbent; contacting in absorber (19) flash-off gas with absorbent to obtain a lean gas and loaded absorbent; regenerating loaded absorbent and partially regenerated absorbent to regenerator (30) to obtain lean absorbent and regenerator off-gas; supplying the regenerator off-gas to sulphur recovery plant (49) to obtain elemental sulphur and off-gas which includes sulphur dioxide; treating the plant off-gas in convertor (55) …
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 December 20, 1989 and granted November 23, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 20, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 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.