Compounds
CA 2022816 A1 · Owner: Smith, Stephen A. · Inventors: Nash, David J.; Ham, Peter; Smith, Stephen A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I), and pharmaceutically acceptable salts thereof:, (I), wherein the Het ring is of sub-formula (a) or (b): (a), (b), wherein, one or two of W1, W2 W3 and W4 is N or NO (such that, if two are NO then these are are W1 and W4) and the, others are CH, CRa or CRb;, one of Q1 Q2 and Q3 is S and the other two are CH and CRC;, either Z1 and Z2 are absent and Z3 Z4 and Z5 and the, carbon atoms to which Z3 and Z5 are attached form a 5-membered non-aromatic heterocyclic ring; or, Z1 is absent and Z2, Z3, Z4, Z5 and the carbon atoms to which Z2 and Z5 are attached, form a 6-membered non-aromatic heterocyclic ring; or, Z1 Z2, Z3, Z4 and Z5 and the carbon atoms to which Z1 and Z5 …
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 August 7, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 7, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 7, 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.