Disc-like sustained release formulation
CA 1279820 C · Owner: Deprince, Randolph B. · Inventors: Deprince, Randolph B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A device for the release of a diffusible solid in a fluid medium which comprises a disc which comprises a substantially uniform mixture of said diffusible solid and a polymer which is insoluble in and impermeable to said fluid medium and impermeable to said diffusible solid. The surfaces of said disc are coated with a polymer which is insoluble in and impermeable to said fluid medium and impermeable to said diffusible solid with the exception of one or more apertures which extend through the disc and expose a portion of the mixture of diffusible solid and polymer to the fluid medium when the device is immersed therein. The aperture or apertures are placed in said disc such that as said …
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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
- Granted February 5, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 5, 2008.
- 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.