Chemical compounds
CA 2031898 A1 · Owner: Jones, Stuart D. · Inventors: Gardner, Colin R.; Jones, Stuart D.; Hedgecock, Charles J. R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for preparing compounds of formula (I), (I), wherein: R2 is H C1-C5 alkyl, a C3-C6 cycloalkyl, a, phenyl or a substituted phenyl; R3 and R4, which may be the same or different, is a H, Hal, -CX3 (in which X is halogen atom),-NO2 -CN, -NRR' (in which R is H or C1-C5 alkyl and R' is a C1-C5 alkyl or R and R' together is a C2-C5 alkylene),a -CONRR' (in which R and R' are defined as above) a -OR7 (in, which R7 is a H, a C1-C5 alkyl or a phenyl); a -SR7 -COOR7 or -COR7 (in which R7 is defined as above)); R5 is a H or F; and either R1 represents a group in which R8 and R'8, which may be the same or different each is a C1-C3 alkyl or R8 and R'8 together represent …
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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 10, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 10, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 10, 2012.
- 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.