Method for purifying gamma-interferon
CA 1237669 A · Owner: Estis, Leonard F. · Inventors: Estis, Leonard F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method is provided for restoring some or all of the activity of gamma-interferon which has been in contact with an acidic solution comprising the steps of: a) placing the gamma-interferon in a solution which has a pH between about 5.5 and 9.5; and b) incubating the solution at a temperature of between about 2°C and 8°C for a period of at least 24 hours. The method allows antibody affinity chromatography employing acid elution to be used to purify gamma-interferon, in that the ac-, tivity of the acid-eluted gamma-interferon can be essentially completely restored using the reactivation process.
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
- Granted June 7, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 7, 2005.
- 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.