Slow release pharmaceutical preparation and method of administering of same
CA 2420854 C · Owner: Liu, Yandi · Inventors: Liu, Yandi; O'Neil, Alexander George B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pharmaceutical preparation adopted for sustained release of an active agent(s) over an extended period of time at a therapeutic rate without an initial burst release of the agent(s) upon administration wherein the , preparation comprises: (i) an outer portion prepared from one or more layers of a biodegradable polymer, which is selected to release an active agent over an extended period of time when positioned in situ in a patient and (ii) an , inner portion comprising a plurality of micro-capsules formed from at least a biodegradable polymer, said micro capsules containing at least an active agent, wherein the micro-capsules are compressed into the form of a tablet under suitable …
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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 September 3, 2001 and granted July 30, 2013. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 3, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 3, 2023.
- 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.