Expired Canadian patentCanada
Optically active piperazine derivative
CA 1320731 C · Owner: Nohira, Hiroyuki · Inventors: Masaki, Mitsuo; Nohira, Hiroyuki; Yamamoto, Masao
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A novel (-)-optically active piperazine derivative of the formula:, (wherein the mark of * indicates an optically active carbon) shows an increased cerebral circulation-improving effect as well as an enhanced safety.
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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
- Granted July 27, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 27, 2010.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledAugust 8, 1989
GrantedJuly 27, 1993
Term endedJuly 27, 2010
Patent numberCA 1320731 C
Classification (IPC)C07D295/09 +2 more
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.