Method for purifying thrombopoietin
CA 2223236 C · Owner: Phan, Linh · Inventors: Downey, William; Phan, Linh; Forstrom, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Methods of removing protein contaminants from a solution comprising thrombopoietin are disclosed. The solution is exposed to hydroxyapatite whereby protein contaminants are bound to the hydroxyapatite and the thrombopoietin remains substantially unbound and the unbound thrombopoietin , is recovered. The use of hydroxyapatite is advantageously combined with other purification and concentration techniques including ion-exchange , chromatography ligand affinity chromatography, hydrophobic interaction chromatography, ultrafiltration, and differential precipitation.
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 May 22, 1996 and granted September 19, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 22, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 22, 2018.
- 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.