Tobacco treatment
CA 2214036 C · Owner: Porter, Andrew R. · Inventors: Porter, Andrew R.; De Grandpre, Yves D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides a method for reducing the protein content of tobacco material which includes extracting the tobacco material with a surfactant and optionally, a proteolytic enzyme. The tobacco material may be first extracted with an aqueous solvent to produce an aqueous extract before being treated with the surfactant. This invention also provides a method for removing polypeptides from an aqueous extract of tobacco material which includes treating the extract with an insoluble adsorbent selected from the group comprising hydroxyapatite and a fuller's earth mineral such as bentonite. Treatment of the aqueous extract with bentonite will produce an extract having a reduced pigment an …
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 December 29, 1992 and granted February 15, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended December 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 29, 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.