Spiro-ketal derivatives and their use as therapeutic agents
CA 2245579 A1 · Owner: Swain, Christopher John · Inventors: Elliott, Jason Matthew; Swain, Christopher John; Kelleher, Fintan
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to compounds of formula (I) wherein R1, R2, R4, R5 and R6 represent a variety of substituents; R3 represents an optionally substituted 5- or 6- membered aromatic heterocyclic group containing 1 2, 3 , or 4 heteroatoms, selected from nitrogen oxygen and sulphur. R9a and R9b each , independently represent hydrogen or C1-4alkyl or R9a and R9b are joined so, together with the carbon atoms to which they are attached there is formed a , C5-7 ring; m is zero 1, 2 or 3; and n is zero, 1, 2 or 3; with the proviso that the sum total of m and n is 2 or 3; or a pharmaceutically acceptable salt thereof. The compounds are of particular use in the treatment or prevention …
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 12, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2019.
- 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.