Oxazole, isoxazole, thiazole and isothiazole amides
CA 1081228 A · Owner: Bristol-Myers Squibb Company · Inventors: Crenshaw, Ronnie R.; Partyka, Richard A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to compounds having the formula, wherein Z is a substituted or unsubstituted oxazole isoxazole, thiazole, isothiazole or alkylthio substituted 1,3,4-oxadiazole group and non-toxic pharmaceutically acceptable acid addition salts thereof and to new nitrogenous, containing heterocyclic carbonyl piperazinyl quinazolines which are potent antihypertensive drugs having generally less a-adrenergic blocking activity than does 2-4-(2-furoyl)piperazin-1-yl-4-amino-6,7-dimethoxyquinazoline which is a known potent antihypertensive drug; and to processes for, their preparation.
Read the whole patent
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
- Granted July 8, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 8, 1997.
- 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.