Antipicornaviral pyridazinamines
CA 2031889 A1 · Owner: Janssen Pharmaceutica Naamloze Vennootschap · Inventors: Van Der Eycken, Cyriel A.M.; Grauwels, Gilbert A.J.; Stokbroekx, Raymond A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Piperidinyl, pyrrolidinyl, azepinyl and piperazinyl pyridazines of formula (I), wherein one or two carbon atoms of moiety may be, substituted with C1-4alkyl C1-4alkyloxy or two carbon atoms of the CH2 groups of said moiety may be bridged with a C2-4alkyloxy radical; X represents CH or N; R1 represents hydrogen C1-4alkyl, halo, hydroxy, trifluoromethyl cyano, C1-4alkyloxy, C1-4alkylthio, C1-4alkylsulfinyl C1-4alkyl-, sulfonyl, C1-4alkyloxycarbonyl C1-4alkylcarbonyl or aryl; R2 and R3 each independently represent hydrogen or C1-4alkyl; Alk represents C1-4alkanediyl; R4 and R5 each independently represent hydrogen C1-4alkyl or halo; and, Het represents (a), (b), (c), (d), (e), (f), (g), (h); …
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 December 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2012.
- 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.