2-hydroxy-5-(1-hydroxy-2- piperazinylethyl)benzoic acid derivatives
CA 1138457 A · Owner: Merrell Pharmaceuticals Inc. · Inventors: Grisar, J. Martin; Claxton, George P.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Derivatives of 2-hydroxy-5-(1-hydroxy-2-piperazinylethyl)benzoic acid are prepared which are usefu1 for their blocking action on .alpha. and ?-adrenergic receptors. In addition, these compounds are useful as spasmolytic and antihypertensive agents.
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 December 28, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 28, 1999.
- 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.