Pharmaceutical compositions comprising ph-sensitive block copolymers and a hydrophobic drug
CA 2530736 C · Owner: Sant, Vinayak · Inventors: Sant, Vinayak; Leroux, Jean-Christophe
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention relates to a pharmaceutical composition of a biologically active agent and a block copolymer composed of a poly(ethylene oxide) forming hydrophilic segment and a poly(butyl (alkyl)acrylate-co- (alkyl)acrylic acid) that is capable of forming supramolecular assemblies or micelles under favourable conditions. The supramolecular assemblies or micelles formed from said polymers associate or dissociate reversibly upon changes in the environmental pH. The pharmaceutical compositions of the present invention contain hydrophobic drugs cations or polycationic , compounds, which can be delivered to the body by oral route or other routes of administration.
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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 April 14, 2004 and granted July 2, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 14, 2024.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 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.