Hepatitis b vaccine
CA 2078694 C · Owner: Carman, William F. · Inventors: Thomas, Howard C.; Carman, William F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A variant HBsAg protein or fragment thereof displaying the antigenicity of Hepatitis B virus surface antigen is disclosed, in which the variant protein or fragment thereof (vHBsAg) comprises a modified 'a' determinant in which there is an amino acid other than glycine at position 145 of the HBsAg sequence. A vaccine comprising the vHBsAg is provided, as is a kit for diagnostic in vitro detection of anti-vHBsAg antibodies and an antibody preparation comprising anti-vHBsAg antibodies.
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 25, 1991 and granted October 27, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 25, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 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.