Expired Canadian patentCanada
Process for solubilizing polyanionic bacterial polysaccharides in aprotic solvents
CA 2017058 C · Owner: Sisko, John T. · Inventors: Hartner, Frederick W.; Sisko, John T.; Calabria, Ralph
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for rendering a bacterial, polysaccharide soluble in aprotic solvents by exchanging the calcium counterion of a polysaccharide calcium salt for tetra-n-alkylammonium ion by precipitation.
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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 May 17, 1990 and granted February 13, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2012.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 17, 1990
GrantedFebruary 13, 1996
Term endedMay 17, 2010
Patent numberCA 2017058 C
Classification (IPC)A61K39/39 +2 more
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.