High molecular weight meningococcal group c vaccine and method for preparation thereof
CA 1112566 A · Owner: Merck & Co. Inc. · Inventors: Carlo, Dennis J.; Hagopian, Arpi; Stoudt, Thomas H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vaccine against Group C meningococcal meningitis consisting of a polysaccharide of which at least 80% by weight has a molecular weight in excess of 1,000,000 daltons is prepared. The polysaccharide was isolated from Group C hexadecyl trimethylammonium bromide cell paste with 1.0M CaC12 extraction and purified by phenol extraction ultra-, centrifugation at 100,000 g. and ethanol fractionation (30%-45% v/v in ethanol).
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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 November 17, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 1998.
- 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.