Volume efficient controlled release dosage form
CA 2481236 A1 · Owner: Edgren, David E. · Inventors: Jao, Francisco; Skluzacek, Robert R.; Wong, Patrick S. L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention includes a dosage form that facilitates the controlled release of an active agent at a desired release rate or release rate profile. In each embodiment, the dosage form of the present invention includes a bilayer membrane system and an osmotic core. The bi-layer membrane system includes a semipermeable membrane and an osmosensitive membrane and forms an internal compartment that is occupied by the osmotic core. The osmotic core of the dosage form of the present invention includes and active agent composition and a light push layer. The dosage form of the present invention additionally includes a passageway that is formed through the bi-layer membrane system and …
Read the whole patent
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 March 28, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 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.