Manufacture of cross-linked amylose useful as an excipient for control release of active compounds
CA 2280534 C · Owner: Carriere, Francois · Inventors: Ingenito, Andre; Carriere, Francois; Dumoulin, Yves
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for the industrial manufacture in an aqueous medium of a slowrelease excipient consisting mainly of cross-linked amylose having controlled release properties, for use in the preparation of tablets or pellets. A starch containing a high amount of amylose (high amylose starch) is first subjected to a gelatinization. The gelatinized high amylose starch is then cross-linked with 1 to 5 g of a cross-linking agent per 100 g of dry-based gelatinized high amylose starch in an alkali medium, thereby forming a reaction medium containing a reaction product consisting of a cross-linked high amylose starch slurry. The obtained reaction medium is neutralized thereby forming by-, products …
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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 February 10, 1998 and granted August 19, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 10, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 10, 2020.
- 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.