Sustained-release opioid formulations and methods of use
CA 2498798 A1 · Owner: Liang, Alfred · Inventors: Boehm, Garth; Liang, Alfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention combines two different subunits with different release profiles in novel sustained-release oral dosage forms. In particular the oral dosage , forms include a subunit that comprises an opioid analgesic and a sustainedrelease material, wherein the dissolution rate in-vitro of the subunit when , measured by the standard USP Drug Release test of U.S. Pharmacopeia XXVI (2003) <724>, is less than about 10% within about 6 hours and at least about 60% within about 24 hours; less than about 10% within about 8 hours and at least about 60% within about 24 hours; less than about 10% within about 10 hours and at least about 60% within about 24 hours; or less than about 10% within …
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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 22, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 22, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 22, 2025.
- 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.