Smoking articles
CA 2069078 C · Owner: British American Tobacco Company Limited · Inventors: Fiebelkorn, Richard Thomas; Dittrich, David John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to low delivery cigarettes usually, having a mainstream particulate matter delivery of about 9mg or less. The cigarettes(1) comprise a rod (2) of tobacco material and a filter element (3). The filter element (3) comprises an alkali filter material section (4) having a loading level of less than 12% by weight of the section. The characteristics of the cigarettes (1) are arranged so that when smoked, the, alkaline filter material is exposed to an amount of smoke acceptable to achieve an increased perception of smoke impact. This is usually achieved by using a low particulate matter potential rod. In this way the moisture free dry particulate matter (NFDPM) to nicotine …
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 May 20, 1992 and granted May 20, 1997. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 20, 2014.
- 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.