Controlled release composition
CA 2329574 A1 · Owner: Johnson & Johnson Consumer Companies, Inc. · Inventors: Lin, Shun Y.; Wearley, Lorraine L.; Wilkinson, Paul K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a composition comprising a sustained release layer and a fast release layer. The sustained release layer comprises a watersoluble polymer, and a first pharmaceutically active agent. The fast release layer comprises a matrix forming, agent and a second pharmaceutically active agent. Generally the composition , provides fast, and sustained (or controlled) release of a pharmaceutically active agent for at least 6 hours and, preferably for at least 1 to 3 days. The composition may be incorporated into a dosage unit, form, such as a vaginal insert. Methods of preparing the composition are also provided.
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 December 22, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 22, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 22, 2022.
- 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.