Coating suspensions (comprising osmopolymers, osmagents) for forming an expandable osmotic composition in controlled release dosage forms as well as the corresponding method for providing this osmotic coating
CA 2490683 A1 · Owner: Dong, Liang-Chang · Inventors: Wong, Patrick S.L.; Shivanand, Padmaja; Dong, Liang-Chang
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention includes an expandable osmotic layer and a coating suspension for providing an expandable osmotic layer both of which are useful , for the manufacture of controlled release dosage forms. The expandable osmotic layer of the present invention may be produced using the coating suspension of the present invention. Advantageously, the coating suspension of the present invention can be used to coat expandable osmotic layers under both wet and dry process conditions without sacrificing the quality of the expandable osmotic layers produced, and therefore provides a relatively robust coating suspension that facilitates commercial production of controlled release dosage …
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 June 28, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 28, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 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.