Ventilated filter cigarette
CA 2002441 C · Owner: Mentzel, Edgar · Inventors: Seidel, Henning; Mentzel, Edgar; Nasseri, Reza
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The ventilated filter cigarettes of the present invention have an American-blend flavor. The cigarettes comprise Virginia tobacco with main stream smoke have a condensate/nicotine ratio of 5:1 to 9:1 a condensate value, of 10 mg maximum, a pH-value greater than 6.0 and a, pollutant index of less than 35. Specific features of this invention include: a filling tobacco comprising Virginia tobacco with a high nicotine content of 2 to 3.5% by weight; a packing density of 150 to 250 mg/cm3; a cigarette paper having an air permeability of 3 to 20 CORESTA units in, which the cigarette rod is in the hardness/haptic range of 1.9 to 2.5 mm ET; a fine-titre cellulose acetate filter having no …
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 November 7, 1989 and granted October 13, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 7, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 7, 2011.
- 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.