Process for crystalline cyclic lipopeptides
CA 2067294 A1 · Owner: Merck & Co. Inc. · Inventors: Mathre, David J.; Schwartz, Robert E.; Kempf, August J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for obtaining a compound of the formula, in crystalline form by solubilizing the compound in warm aqueous n-propanol and then allowing the solution to stand at ambient temperature until crystal formation is substantially complete is described. The crystalline compound obtained thereby is also described.
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 April 27, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 27, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 27, 2014.
- 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.