Gas separation
CA 2201054 A1 · Owner: The Boc Group Plc · Inventors: Watson, Richard William; Stuart, David Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A burner 4 and furnace 6 are operated to form a gas mixture comprising hydrogen sulphide sulphur dioxide, carbon dioxide, water vapour and sulphur vapour from a feed gas stream comprising hydrogen sulphide and carbon dioxide. Sulphur vapour but not water vapour is extracted in a condenser 16. All the hydrogen sulphide is oxidised to sulphur dioxide (or all the sulphur dioxide reduced to hydrogen sulphide) in a reactor 22. The resulting gas mixture is dried in drier 30 and compressed in compressor 32. It is then fractionally distilled in distillation column 38. A top fraction essentially free of sulphur compounds is vented while a bottom fraction may be recycled to the furnace 6.
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 March 26, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2019.
- 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.