Compounds
CA 2000041 A1 · Owner: Orlek, Barry S. · Inventors: Orlek, Barry S.; Faulkner, Richard E.; Orlek, Barry S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A compound of formula (I) or a pharmaceutically acceptable salt thereof:, (I), in which one of X and Y represents hydrogen and the other represents Z, where Z is a group in which Q represents a 3-membered divalent residue completing a 5-membered aromatic ring and comprises one heteroatom selected from oxygen, nitrogen and sulphur or two heteroatoms selected from sulphur and nitrogen any amino nitrogen being optionally substituted by a C1-2 alkyl, and at least one ring carbon atom being substituted by a group R1; or a group, in which A1 A2 and A3 complete a 5-membered aromatic ring and A1 is oxygen or sulphur, A2 is CR2 and A3 is nitrogen or CH, or A2 is oxygen or sulphur A1 is CH, and A3 is …
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 October 2, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 2, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 2, 2011.
- 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.