Benzisoxazole derivatives and pharmaceutical compositions containing them
CA 2117471 C · Owner: Boyd, Edward Andrew · Inventors: Boyd, Edward Andrew; Costall, Brenda; Kelly, Mary Elizabeth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) in which R1 represents hydrogen a C1-6 aliphatic hydrocarbyl group or a C1-4 aliphatic hydrocarbyl group substituted by a C3-6 alicyclic hydrocarbyl group or by a phenyl group which phenyl group is unsubstituted, or substituted by a halogeno or C1-3 halogenoalkyl group R2 represents hydrogen, R3 represents hydrogen a 5- or 6-membered, ring aromatic heterocyclyl group containing one or two heteroatoms selected from nitrogen oxygen and sulphur, which is unsubstituted or substituted by a halogeno or C1-3 halogenoalkyl group or a group AR wherein A is a straight, chain C1-4 aliphatic hydrocarbyl group terminally substituted by R which is hydrogen a phenyl group or a 5- …
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 February 18, 1993 and granted April 22, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 18, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 18, 2015.
- 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.