Filter cigarette
CA 2596475 C · Owner: Pienemann, Thomas · Inventors: Peters, Gunther; Pienemann, Thomas; Seidel, Henning
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a filter cigarette having a tobacco strand a , wrapping and a filter, the filter possesses at least one gas phase-active filter part which contains at least one gas phase-reducing substance. The gas phase-reducing substances are embedded in a filter material matrix. They are introduced in a quantity of at least 75 mg per filter and at least 5 mg/mm of the length of the gas phase--active filter part. The filter cigarette exhibits a filter ventilation of at most 30% (or of from 30% to 70%). The NFDPM value is between 4 and 10 mg/cigarette (or in the range of from 2 to 4 mg/Cigarette) as , measured in accordance with ISO smoking conditions. The gas phase quotient Q1, defined as …
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 January 16, 2006 and granted March 5, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2026.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.