Naphthyridine derivatives
CA 2022322 A1 · Owner: Dreikorn, Barry A. · Inventors: Davis, Leon N.; Coghlan, Michael J.; Caley, Blake A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
X-7713, Abstract, Substituted naphthyridines of the formula (1): (1), wherein, one of A, B, E, or D is N and the others are, CRl;, R1 and R2 are independently H or halo. X is O S, SO, SO2, NR3, or CR4R5, where R3 is H, (C1-C4) alkyl, or (C1-C4) acyl, and R4 and R5 are independently H, (C1-C4) acyl, (C1-C4) alkyl (C2-C4) alk-, enyl or -alkynyl, CN, or OH or R4 and R5 combine to form, a carbocyclic ring containing four to six carbon atoms; Y is nil, Z being bonded directly to X or Y, is an alkyl chain one to six carbon atoms long option-, ally including a carbocyclic ring and optionally includ-, ing a hetero atom selected from O S, SO, SO2, NR3, or, SiR19R20, where R19 and R20 are …
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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 July 25, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 25, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 25, 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.