Smoking article
CA 2010729 C · Owner: Brown & Williamson Tobacco Corporation · Inventors: Templeton, Leroi King
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A smoking article includes a fuel rod, an insulation section at one end of the fuel rod, a tobacco plug at the end of the insulation return, a cooling chamber at the end of the insulation section, and a filter at the end of the chamber. A tube extends concentrically through the fuel rod to the tobacco plug. The tube is filled with an air permeable substrate including an aerosol generating substance. A heat conducting strip extends concentrically in the substrate in the tube and into the tobacco plug.
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 February 22, 1990 and granted March 12, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 22, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 22, 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.