Controlled release compositions comprising coated pellets having non-uniform coating thicknesses
CA 2491355 A1 · Owner: Speirs, Christopher J. · Inventors: Clark, Michael; Williams, Richard; Speirs, Christopher J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved composition for controlling the release profile of an active compound through the intestinal tract comprises particles especially pellets, containing the active compound which are coated with a pH dissolution dependent coating material or a polymethacrylate material which is preferably , pH dissolution dependent to a certain thickness depending upon the location and rate of release of the active compound that is desired. In preferred compositions, two or more pluralities of particles in which particles of each , plurality are coated with pH dissolution dependent coating material or polymethacrylate material to a different thickness to those of each other plurality, are …
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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 4, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 4, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 4, 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
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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.