Process for preparing biomedical grade chitin and chitosan
CA 2101079 A1 · Owner: Jeon, Dong-Won · Inventors: Jeon, Dong-Won
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a process for preparing a biomedical grade chitin of a high purity and whiteness with a high molecular weight and a biomedical grade chitosan of a high degree of deacetylation and high molecular weight from the chitin produced in accordance with the present invention. Specifically the process for preparation of the chitin in accordance with the present invention comprises the steps of:, (A) drying crustaceous shells and crushing the dried shells to provide a finely crushed powder; (B) digesting initially the powder in a HCl solution at a temperature ranging from -10 to 10°C for a period ranging from 10 to 25 hours and, thereafter, further digesting the powder …
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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 July 21, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 21, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 21, 2015.
- 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.