Indole derivatives
CA 2117643 C · Owner: Nowakowski, Jolanta T. · Inventors: Macor, John E.; Nowakowski, Jolanta T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Compounds of formula (I) where A represents a direct bond C1-C4 alkyl, or C1-C4 alkenyl; n is 0, 1 or 2; R1 is, hydrogen, C1-C6 alkyl, aryl C1-C3 alkylaryl, C1-C3 alkylheteroaryl or -(CH2)mR6; W,X,Y, and Z are each independently oxygen sulfur, nitrogen or carbon, provided that at least one of W X, Y or Z is nitrogen; R2,R3,R4, and R5 are each independently hydrogen, C1-C6 alkyl, aryl, C1-C3 alkylaryl C1-C3 alkylheteroaryl, halogen, cyano trifluoromethyl nitro, -OR7,-NR7R8, -(CH2)sOR7,-SR7, -SO2NR7R8.-NR7SO2R8,-NR7CO2R8,or -CONR7R8 or -CO2R7; one of R2 and R3,R3 and R4, or R4 and R5 may be taken together to form a five- to seven-membered alkyl ring a six-membered aryl ring, a five- to …
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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 March 3, 1993 and granted March 14, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 3, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 3, 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.