Method of preparing granular n-alkyl-ammonium acetonitrile salts
CA 2368481 A1 · Owner: Kinder, Hans-Jurgen · Inventors: Kinder, Hans-Jurgen; Schonherr, Michael; Mundinger, Klaus
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to an improved method for the preparation of granular Nalkyl ammonium acetonitrile salts of formula (I) R2R3N+R1-CR4R5-CN Y-in which R1 to R5 are hydrogen or organic rests and Y- is a sulfate or hydrogen sulfate anion; from an aqueous solution of the compound of formula (II) R2R3N+R1-CR4R5- CN R6O-SO2-O- in which R6 is C1 to C4 alkyl. According to the invention the aqueous solution is evaporated at a temperature of between 80 and 250 ~C and a pressure of between 10 mbar and 2 bar so as to obtain a melt and said melt is then left to solidify. During or after evaporation usual carrier materials and/or auxiliaries can be added. Lastly the resulting solidified …
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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 17, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 17, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2022.
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Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.