Purification of hepatitis proteins
CA 1339792 C · Owner: Siegel, Robert S. · Inventors: Siegel, Robert S.; Craig, William S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention pertains to a process for recovering hepatitis B surface antigen from recombinant Pichia pastoris cells comprising:, a) lysing said yeast cells in the presence of a buffered chaotropic salt and separating the hepatitis B surface antigen-containing supernatant from said lysed cells; b) subjecting the hepatitis B surface, antigen-containing supernatant obtained in step (a) to conditions suitable to precipitate lipids and contaminant proteins from said supernatant;, c) subjecting the hepatitis B surface antigen-containing supernatant obtained in step (b) to diafiltration; d) contacting the hepatitis B surface, antigen-containing retentate obtained in step (c) with silica; …
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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 March 31, 1998. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 31, 2015.
- 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.