Pyridinecarboximidamide compounds and the use thereof
CA 2129013 C · Owner: Okawara, Hideki · Inventors: Kashiwabara, Tomoko; Nakajima, Tatsuo; Kaneta, Soichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed are pyridinecarboximidamides having a vasodilating effect (hypotensive activity or antianginal activity), and acid adduct salts thereof. (see formula I) wherein, when R1 represents an alkyl, hydroxyalkyl carboxyl, amino, acylamino, alkylamino dialkylamino, aralkylamino, alkylsulfonamide bisalkylsulfonylamino or, hydroxyl group R2 represents a hydrogen atom and R3, represents a nitroxyl 2-chlorophenyl or phenyl group;, and, when R1 represents a hydrogen atom R2 represents, an alkyl, hydroxyalkyl, carboxyl amino, acylamino, alkylamino, dialkylamino aralkylamino, alkylsulfonamide, bisalkylsulfonylamino or hydroxyl group and R3 represents a nitroxyl, 2-chlorophenyl or phenyl group. …
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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 January 28, 1993 and granted August 14, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 28, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 28, 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.
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.