Gram-negative bacterial vaccines
CA 2123222 C · Owner: Roberts, David S. · Inventors: Roberts, David S.; Swearingin, Leroy A.; Dearwester, Donald A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided by this invention a novel method of preparing Gram-negative bacterial vaccines. The method comprises providing a concentrated Gram-negative bacterial antigenic preparation adsorbing the preparation with a mineral carrier capable of binding free-endotoxin in the antigenic preparation in an amount effective to produce optimal binding of endotoxin and antigen and diluting the adsorbed preparation for use in a vaccine. Also provided by this invention is a vaccine produced by the method of this invention. Also provided by this invention is a Gram-negative bacterial vaccine wherein the improvement comprises a concentration of mineral carrier in the vaccine which is less …
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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 November 13, 1992 and granted February 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 13, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 13, 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.