Smoking article wrapper and method of making same
CA 1313754 C · Owner: Martin, Richard Hugo · Inventors: Kaufman, Clifford Mark; Martin, Richard Hugo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A smoking article wrapper which when combined with a suitable tobacco column produces up to 75% less particulate sidestream smoke than do prior art cigarette paper wrappers and to methods of producing same. The paper contains freshly precipitated magnesium hydroxide filler precipitated by an equal or near equal stoichiometric addition rate process in the presence of the particulate magnesium hydroxide and/or calcium co-filler(s) and in the absence of the cellulosic pulp fibers.
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 February 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 23, 2010.
- 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.