Polyvalent metallic salts of sulfure derivatives of benzyliden-camphor and use to protect the skin against uv

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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

• Filed November 22, 1989 and granted November 9, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 22, 2009.
• A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 22, 2011.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.