A method for increasing the yield of 2,6-nda
CA 2383353 A1 · Owner: Mossi & Ghisolfi Overseas S.A. · Inventors: Brownscombe, Thomas F.; Diaz, Zaida
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a method of increasing the yield of 2,6-NDA which comprises: a) Dissolving a disproportionation reaction product containing a dialkali salt of 2,6-NDA in water and filtering off insoluble matter from the resulting solution; b) Precipitating the monoalkali salt of 2,6-NDA (KHNDA) with CO2; c) Suspending said monoalkali salt in water in a weight ratio higher than 8:1 water:monosalt; and d) Heating at a temperature above 100~C and at a pressure above 100 psig. The improvements in yield are from about 20 % to as high as 45 %.
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 August 8, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 8, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 8, 2022.
- 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.