Aminopyridine compounds
CA 2062672 A1 · Owner: Sakashita, Hiroshi · Inventors: Fukaya, Chikara; Sakashita, Hiroshi; Eda, Masahiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An aminopyridine compound represented by the formula:, wherein n represents 0 or 1; Z represents =S =O, =NCN or, =CHNO2; R1 represents -CN -NR3R4, -CONR3R4, -NHNR3R4, -NHCONHR3, -NHSO2R3 or -SR3; R2 represents H or substituted, or unsubstituted alkyl; R3 and R4 which may be the same or, different, represent H substituted or unsubstituted alkyl, aryl substituted or unsubstituted acyl or alkoxycarbonyl group; and R3 and R4 may form a heterocyclic ring together with a nitrogen atom to which R3 and R4 are bound through, another heteroatom or without it; or an acid salt thereof which is excellent in pharmacological effect and repressed in side effects as a drug for circulatory diseases. - 89 -
Read the whole patent
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 March 11, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 11, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 11, 2014.
- 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.