Method for preparing chitosan
CA 2082859 A1 · Owner: Chiba, Tohru · Inventors: Takiguchi, Yasuyuki; Chiba, Tohru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for preparing chitosan comprises the steps of adding an aqueous organic acid solution having a concentration ranging from 0.5 to 10 % (w/v) to alkaliinsoluble substances obtained by treating cultured filamentous fungi with a hot aqueous alkali solution and stirring and mixing the dispersion while heating it at a temperature ranging from 50 to 100 °C to extract chitosan. The method for preparing chitosan makes it possible to provide chitosan in a high productivity. Chitosan is an important biomass and may be used in various fields such as a flocculating agent for polymers, an immobilization support and porous beads.
Read the whole patent
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. No grant is recorded for it in Canada; had it been granted, its 20-year term would have 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.