Spirocyclic benzopyran imidazolines
CA 2113818 A1 · Owner: The Upjohn Company · Inventors: Gadwood, Robert C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Spiro-4H-1-benzopyran-4,4'-5'H-imidazol-5'-ones of Formula (1) wherein R1 is H, R2, F, Cl, Br, CF3, CF3O CN, NO2, R2SO2, R2NHSO2, R2O, R2CO, R2OCO or R2NHCO. R2, is a C1-C10 branched or linear alkyl a C3-8 cycloalkyl, phenyl, or benzyl. X can be S O, or NH. Both enantiomers are, included in this invention as well as salts and tautomeric forms of these compounds. The subject compounds are useful in the treatment of hypertension, alopecia, and erectile dysfunction.
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 3, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 3, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 3, 2014.
- 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.