Heteroannulation process
CA 2092782 A1 · Owner: Audia, James Edmund · Inventors: Lawhorn, David Ernest; Audia, James Edmund
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heteroannulation process for preparing piperidones and tetrahydropyridones by reacting an appropriately substituted enamine with an acryloyl derivative wherein a leaving group occupies the carbonyl; a process for cleaving a l-phenylethyl group from an acylated amino group or an heterocyclic nitrogen atom adjacent to a carbonyl group particularly that on the nitrogen atom of the products of the heteroannulation process, is also provided.
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 26, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 26, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 26, 2015.
- 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.