Variable air dilution cigarette filter
CA 1237356 A · Owner: Reynolds (R.J.) Tobacco Company · Inventors: Deal, Philip A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, A variable air dilution cigarette filter is disclosed. A thin, generally rigid cylindrical sleeve having internal retention steps or barbs is provided with one or more air passing slots or perforations. A filter rod having a filter wrap is inserted within the cylindrical tube or sleeve and is held within the tube by the retention steps. Relative rotation between the sleeve and the filter rod varies the amount of smoke diluting air which is allowed to pass through the slots in the sleeve and thence through the filter rod. A tobacco rod is joined to the sleeve by tipping paper or the like to thereby produce a cigarette incorporating the variable air dilution …
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
- Granted May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- 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.