Recombinant dna provided with hepatitis b virus gene, mammalian cells transformed with cloned viral dna, and production of hepatitis b virus proteins
CA 1287311 C · Owner: Hamada, Fukusaburo · Inventors: Ohtomo, Nobuya; Nozaki, Chikateru; Miyanohara, Atsushi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure:, The invention provides a recombinant DNA comprising a Hepatitis B virus gene recombined with a vector consisting essentially of a replication origin of SV40 DNA inserted into Escherichia coli plasmid and being preferably deficient in a region of inhibiting replication in mammalian cells. The invention also provides mammalian cells transformed with the recombinant DNA, and a method of production of Hepatitis B virus proteins, i.e. HBsAg and/or HBeAg. These HBV proteins have the same immunological properties as those of the natural HBV proteins originating from human blood plasma and can be used fox the preparation of HBV vaccine and diagnostic reagents.
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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 August 6, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 6, 2008.
- 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.