Improved method for purifying cholera toxin
CA 2322846 A1 · Owner: Department Of The Army, U.S. Government · Inventors: Dertzbaugh, Mark
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a method of purifying cholera toxin or the enterotoxin of E. coli using a matrix with at least on e ion chosen from among matrix with Ni+2, Co+2, Cd2 or Zn+2 immobilized thereon. It is possible thereby to selectively elute the B subunit for cholera toxin from the matrix.
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 5, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 5, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 5, 2021.
- 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.