Quinazoline derivatives and their preparation
CA 2033363 A1 · Owner: Yamazaki, Hitoshi · Inventors: Tanaka, Hirokazu; Hashimoto, Masashi; Shimazaki, Norihiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
AsSTRACT, Compounds of the formula:, in which R1 and R2 are each hydrogen halogen, nitro, amino, protected amino hydroxyamino, lower alkyl, hydroxy, protected hydroxy, sulfamoyl, carboxy, protected carboxy, mercapto, heterocyclic-carbonyl heterocyclic-(lower)alkyl, lower, alkylthio hydroxy(lower)alkyl or, protected hydroxy(lower)alkyl R3 is aryl which may have suitable, substituent(s) and, A is lower alkylene, or pharmaceutically acceptable salts thereof. These compounds can be used as dopamine receptor agonist 5-HT receptor antagonist, especially 5-HT2 receptor antagonist; .alpha.1 receptor antagonists. The therapeutic treatment of these receptor mediated diseases particu-, larly …
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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 28, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 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.