Packaging smoking materials
CA 2077090 A1 · Owner: Drewett, Christopher G. · Inventors: Purkis, Stephen W.; Drewett, Christopher G.; Chard, Brian C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Packaging Smoking Material, There is provided a pouch 10 containing tobacco 11 and a moisturising element 13 containing a measured quantity of water in a fibrous pad. This element is sealed from the tobacco 11 by a vapour permeable liquid barrier 14 comprising a vapour permeable outer layer 15 and an inner, degradable liquid barrier 16. After a predetermined period of time the barrier 16 starts to degrade or dissolve thus allowing the moisture in the element 13 to pass into the tobacco 11 as a vapour through the vapour permeable layer 15.
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 August 28, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 28, 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.