Pseudo-thermosetting neutralized chitosan composition forming a hydrogel and a process for producing the same
CA 2560432 C · Owner: Reist Oechslin, Marianne · Inventors: Reist Oechslin, Marianne; Gurny, Robert; Berger, Jerome
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The composition disclosed is a pseudo-thermosetting neutralized chitosan composition, neutralized with an hydroxylated base forming a phosphate-free , transparent hydrogel at a temperature higher than 5~C. Said composition contains a homogeneously reacetylated chitosan derived from a chitosan having a deacetylation degree of 80 - 90 %, having a molecular weight of not smaller than 200 kDa and a deacetylation degree of 30 - 60 % and may further contain , a diol. Said composition may be used as a drug delivery system.
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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 March 22, 2004 and granted October 9, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2026.
- 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
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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.