Process for purification of polypeptide
CA 2057014 C · Owner: Shiseido Company, Ltd. · Inventors: Tajima, Masahiro; Kaminuma, Toshihiko; Iida, Toshii
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for purifying a polypeptide using a packing material for reversed phase high performance liquid chromatography is provided. A process for purifying a polypeptide characterized in that an aqueous solution containing polypeptide obtained by pre-treating a polypeptide produced by a wide variety of cells to a predetermined state is adjusted to a specific pH value, to remove impurities and is then treated with a packing material for reversed phase high performance liquid chromatography.
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 March 29, 1991 and granted July 24, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 29, 2013.
- 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.