Process for the preparation of o-substituted oximes
CA 2136497 A1 · Owner: Novartis Ag · Inventors: Blaser, Denis
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a process for the hydroxyalkylation of aldoximes and ketoximes by reacting said oximes with unsubstituted or substituted ethylene or propylene carbonate in the presence of a catalyst, which comprises the use of catalytic amounts of aN-alkylated stable, organic amidine base or a pyridine which is substituted by a secondary amino group. The compounds are important intermediate for the synthesis of herbicides.
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 November 23, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 23, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 23, 2016.
- 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.