Cyclic amide derivatives
CA 2175502 C · Owner: Nagato, Satoshi · Inventors: Nagato, Satoshi; Iimura, Youichi; Kosasa, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cyclic amide derivatives defined by the formula: R1 - (CH2)n-Z (I), or a salt thereof are disclosed in which R1 is a group, derived from a substituted or unsubstituted cyclic amide compound, n is zero or an integer of 1 to 6 and Z is a group: in which R2 is an aryl, a halogen-substituted aryl a, cycloalkyl or a heterocyclic group, m is an integer of 1 or 2, R3 is hydrogen or a lower alkyl, R4 is an aryl or a halogen-substituted aryl, a cycloalkyl or a heterocyclic group, and p is an integer of 1 or 2, provided that when the cyclic amide compound is quinazolinone or quinazoline-dione R2 aid R4 are neither aryl nor substituted aryl. The cyclic amide compounds are pharmacologically effective …
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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 June 13, 1991 and granted July 10, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 13, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 13, 2013.
- 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.