Multiple hepatitis b virus surface proteins which form particles
CA 2067590 A1 · Owner: Kniskern, Peter J. · Inventors: Short, Kathryn R.; Burke, Pamela; Hagopian, Arpi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In order to produce a mixture hepatitis B virus (HBV) surface proteins in the form of particles DNA, encoding two or more HBV proteins was expressed by a single recombinant yeast. In order to form particles with substantially reduced carbohydrate such DNA, encoding two or more HBV proteins is expressed in a single recombinant yeast host which is deficient in its ability to glycosylate proteins. These B V proteins display the antigenic sites genetically encoded by the S domain (including the preS domain) of the HBV virion envelope open reading frame and 43/JWW24 - i - 18350, when expressed in a yeast deficient for its ability to glycosylate, contain substantially reduced levels of entrapped …
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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
- Filed April 29, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 29, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 29, 2014.
- 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.