Method for treating lactams
CA 2268807 C · Owner: Leconte, Philippe · Inventors: Leconte, Philippe; Chiarelli, Henri
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns a method for treating lactams directly derived from the synthesis process avoiding as far as possible the formation of oligomers. More precisely it concerns a method for treating a lactam from a reaction flux derived from aromatising hydrolysis of an aminonitrile characterised in that the reaction flux coming out of a hydrolysis reactor is cooled in a time interval of not more than 1 hour at a temperature not more than 150 DEG C before its fractionation.
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 October 23, 1997 and granted July 8, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 23, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 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
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.