Treatment of tobacco
CA 1252012 A · Owner: British-American Tobacco Company Limited · Inventors: Hedge, Roger W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
16-, "Improvements Relating to the Treatment of Tobacco" A B S T R A C T, In the expansion of tobacco the tobacco is entrained, in hot gaseous medium separated from the gaseous medium, and re-introduced and re-entrained in the gaseous medium before being once again separated from the medium.
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
- Granted April 4, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 4, 2006.
- 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.