Process for phosphate ester compounds of certain cyclohexapeptides
CA 2074759 A1 · Owner: Balkovec, James M. · Inventors: Loewe, Mallory F.; Balkovec, James M.; Mathre, David J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A facile process for preparing a compound of the formula, or a salt thereof, wherein R R1, R2, R3, R4, X, X1 Y, and Z are as defined in the specification by direct, phosphorylation of the corresponding phenolic compound with tetrabenzyl pyrophosphate in the presence of lithium hydroxide is 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 July 28, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 28, 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.