Process for purifying a solution of an ampicillin pro-drug ester
CA 2315082 A1 · Owner: Federsel, Hans-Jurgen · Inventors: Konberg, Erik; Federsel, Hans-Jurgen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for purifying a solution of an ampicillin pro-drug e.g. , bacampicillin, or an acid addition salt thereof which comprises a step , wherein a crude solution thereof is subjected to an evaporation which is controlled by the evaporation rate of the organic solvent such that a continous operation is accomplished for the crystallization of the desired purified pro-drug ester, or salt thereof. Said crystallization is preferably preceded by an aqueous phase extraction and/or an organic phase extraction both preferably also being performed continuously.
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 December 16, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 16, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 16, 2020.
- 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.