Osmotic delivery system
CA 2474425 A1 · Owner: Roy, Michael Christopher · Inventors: Shamblin, Sheri Lynn; Fergione, Michael Bruce; Waterman, Kenneth Craig
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An osmotic pharmaceutical tablet is described which comprises a single-layer compressed core surrounded by a water permeable layer having a passageway. The single-layer core contains (i) a non-ripening drug having a solubility per dose less than about 1 mL-1, (ii) about 2.0% to about 20% by weight of a hydroxyethylcellulose having a weight-average molecular weight from about , 300,000 to about 2,000,000 and (iii) an osmagent.
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 January 28, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 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.