Derivatives of aspartic acid and glutamic acid having anti-cholecystokinin activity
CA 2087193 A1 · Owner: Broughton, Howard B. · Inventors: Mcdonald, Iain M.; Kalindjian, Sarkis B.; Hull, Robert A. D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cholecystokinin antagonists are provided having formula (I) wherein Ar is (a), (b), (c), (d), (e), (f) or (g) (wherein the aromatic moiety may be substituted or unsubstituted) or (h); R1 is H, C1 to C6 alkyl, C1 to C6 alkenyl cycloalkyl, -(CH2)qaryl, -(CH2)q(substituted aryl) or -(CH2)qheterocyclic wherein q is 0 to 4; R2 is H, methyl or ethyl; T is carboxyl -CONR5R6 (wherein R5 and R6 are independently H or C1 to C4 alkyl) or tetrazolyl; n is 0 to 3, and Q is (i) or (j) wherein X is C1 to C4 alkyl, C1 to C4 alkoxy C1 to C4, thioalkoxy, carboxy, C1 to C4 carboalkoxy nitro, trihalomethyl, hydroxy, -NR7R8 (wherein R7 and R8 are independently H or C1 to C4 alkyl), C1 to C4 alkylaryl C1 to C4, …
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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 July 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2013.
- 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.