A process for producing an aliphatic amide and salts thereof
CA 2054491 A1 · Owner: Kagara, Kooji · Inventors: Kagara, Kooji; Machiya, Koji; Takasuka, Kiyoaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Production of an aliphatic amide of the general formula, I, wherein R1 through R3 may be the same or different and each means a hydrogen at,om or a lower alkyl group or a salt thereof, II, wherein R1 through R3 are as defined above with a, carbamoyl-containing Wittig reagent and reacting the reaction product, either without isolation or after isolation, further with a dinitrogen trioxide or in, the presence of an acid or a nitrite This process has the advantage of being less costly and of reducing the number of steps involved.
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 29, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 29, 2013.
- 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.