Process for the treatment of cigarettes, cigars, tobacco, and other tobacco products so as to reduce or prevent the noxious effect of the smoke, as well as tobacco products so treated

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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 September 23, 1969. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 23, 1986.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.