Alginate microcapsules, methods of making and using same
CA 2034633 A1 · Owner: Smidsrod, Olav · Inventors: Skjak-Braek, Gudmund; Skjak-Braek, Gudmund; Otterlei, Marit
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved Alginate Microcapsules, Methods of Making and Using Same Abstract, A composition for containing biological material for in vivo implantation and transplantation comprising alginate cross-linked with barium salt preferably barium, chloride. The microcapsule may optionally have as its other layers hyaluronic acid and poly-L-lysine. Also alginate cross-linked with both calcium chloride and barium chloride may be used. The microcapsule of the present invention is rugged and retains a strong negative charge, enhancing the release of protein and limiting the invasion of immunoglobulins. The microcapsule may preferably be used for encapsulating islets of Langerhans for the production of …
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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 January 21, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 21, 2013.
- 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.