Process for converting lipid-containing bacterial capsular polysaccharide into lipid-free polysaccharide
CA 2075681 C · Owner: Sitrin, Robert D. · Inventors: Rienstra, Mark S.; Sitrin, Robert D.; Lee, Ann L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for converting lipid-containing bacterial capsular polysaccharide, such as lipo-polyribosyl ribitol phosphate, lipo-PRP into, lipid-free, endotoxin-free polysaccharide such as, polyribosyl ribitol phosphate PRP, by solubilizing, polysaccharide-containing powder derived from culture media of bacteria, such as Haemophilus influenzae type b, cleaving covalently bound fatty acids from the polysaccharide, and removing the lipids and endotoxin.
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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 August 10, 1992 and granted March 25, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 10, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 10, 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.