Novel mercaptoacetylamido pyridazo1,2pyridazine, pyrazolo1,2pyridazine, pyridazo1,2-a1,2diazepine and pyrazolo1,2-a1,2diazepine derivatives useful as inhibitors of enkephalinase and ace

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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 April 21, 1993 and granted July 7, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 21, 2013.
• A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 21, 2015.
• We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.