N-phenyl-n'-phenylpropylpiperazine derivatives and process for the preparation thereof
CA 2336083 A1 · Owner: Zeria Pharmaceutical Co. Ltd. · Inventors: Takei, Mineo; Higashino, Raita; Chikazawa, Jun
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
N-Phenyl-N'-phenylpropylpiperazine derivatives represented by general formula (1) (wherein R1 is lower alkyl; R2 is lower alkoxy; and R3 is cyano carboxyl , or indolecarbonyl); drugs containing the same; and a process for the preparation thereof. The compounds exhibit potent .alpha.1-adrenergic receptor blocking activity and are useful in the prevention and treatment of hypertension, congestive heart failure myocardial ischemia, arrhythmia, angina pectoris urinary disturbance and frequent urination due to prostatic hypertrophy, and so on.
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
- Filed June 28, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 28, 2021.
- 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.