Substituted phenylcarbamates and phenylureas, their preparation and their use as 5-ht antagonists
CA 2133083 A1 · Owner: Glaxo Group Limited · Inventors: Oxford, Alexander W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substituted phenylcarbamates and ureas of formula (I) wherein R1 represents a hydrogen or a halogen atom or a C1-6alkyl, C1-6alkoxy or hydroxy group; R2 represents an oxadiazole or thiadiazole ring substituted by a group selected from C1-6alkyl C3-7cycloalkyl, -CH2C2-5alkenyl, -CH2C2-5alkynyl phenyl, or benzyl; X represents NH or an oxygen atom; m represents 0 1 or, 2; R3 represents C1-6alkyl, benzyl -(CH2)nR4 or (a); , R4 represents a group selected from cyano hydroxyl, C1-6alkoxy, phenoxy, C(0)C1-6alkyl C(0)C6H5, -CONR6R7, -NR6COR7, -SO2NR6R7 or -NR6SO2R7 (wherein each of R6 and R7 independently represent a hydrogen atom a C1-6alkyl or, phenyl group); n represents 2 or 3; R5 represents …
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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 26, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2015.
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Timeline
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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.