Method for the isolation and purification of hepatitis b surface antigen
CA 1259922 A · Owner: Smith Kline - Rit · Inventors: Simonet, Guy; Van Wijnendaele, Frans
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved method for the isolation and purification of hepatitis B surface antigen, Abstract, The supernatant of engineered yeast cells having produced hepatitis B surface antigen and disrupted in the presence of a polysorbate non-ionic detergent is clarified by addition of urea and adsorbed on colloïdal silica from which the purified antigen is desorbed with a low ionic strength buffer supplemented with urea and a polysorbate non-ionic detergent.
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 September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- 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.