Ventilated filter cigarette with a coaxial filter element
CA 2235537 C · Owner: Schneider, Werner · Inventors: Schneider, Werner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention refers to a ventilated filter cigarette comprising a tobacco rod a wrapper for the, tobacco rod and a filter ventilated through ventilation openings including a coaxial filter, element, comprising a filter core a wrapper for the filter core, a filter jacket and a wrapper for the filter jacket, in which the material specifications of the tobacco rod and the filter and the dimensions of their individual components are designed to allow the smoke to flow mainly through the filter core (upon open ventilation zone) and when covering the ventilation openings, the smoke of the cigarette flows to a major degree through the filter jacket of the coaxial filter element.
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 April 22, 1998 and granted December 5, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 22, 2020.
- 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.