Novel asymmetric synthesis of r-.alpha.-propyl-piperonyl amine and its analogs
CA 2249401 A1 · Owner: The Dupont Merck Pharmaceutical Company · Inventors: Anzalone, Luigi; Waltermire, Robert Eugene; Li, Hui-Yin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Processes for the preparation of R-.alpha.-propyl-piperonyl amine and its analogs, such compounds being useful intermediates in the preparation of elastase inhibitors, and intermediates useful for making R-.alpha.-propylpiperonyl amine are described.
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 March 17, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2019.
- 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
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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.