Prevention of sulfur gas emissions from a rotary processor using lime addition
CA 2109176 C · Owner: 1548784 Alberta Ltd. · Inventors: Koszarycz, Roman; Taciuk, William; Begley, Adrian
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Oil sand is treated to prevent the production of sulfur dioxide ("SO2") from a known rotating kiln-type processor. Lime or calcium oxide ("CaO") is added with the oil sand feed to the kiln. In the kiln the CaO is mixed with the sulfur-containing bitumen of the oil sand and preheated. The preheated mixture is then pyrolysed forming coke which is modified by the added CaO to reduce its tendency to produce SO2 when combusted. The modified coke is then combusted with air producing, substantially no SO2.
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 25, 1993 and granted June 16, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 25, 2015.
- 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.