Benzodioxole derivatives
CA 2058254 A1 · Owner: Imperial Chemical Industries Plc · Inventors: Kingston, John Francis; Waterson, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a benzodioxole derivative of the formula I I, wherein Ar1 is an optionally substituted 9- or 10-membered bicyclic heterocyclic moiety containing one or two nitrogen heteroatoms and optionally containing a further heteroatom selected from nitrogen oxygen and sulphur;, R1 is (1-6C)alkyl (3-6C)alkenyl or (3-6C)alkynyl; and, R2 and R3 together form a group of the formula -A1-X-A2- which together with the carbon atom to which A1 and A2 are attached defines, a ring having 5 to 7 ring atoms wherein each of A1 and A2 is, (1-3C)alkylene and X is oxy thio, sulphinyl or sulphonyl, and which ring may bear one or two substituents; or a pharmaceutically-acceptable salt thereof; …
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 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 20, 2013.
- 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.