Controlled release dihydrocodeine composition
CA 1288350 C · Owner: Euroceltique S.A. · Inventors: Leslie, Stewart Thomas; Malkowska, Sandra Therese Antoinette; Miller, Ronald Brown
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid controlled release, oral dosage form the dosage form, comprising an analgesically effective amount of dihydrocodeine or a salt thereof in a controlled release matrix wherein the dissolution rate in vitro of the dosage form, when measured by the USP Paddle Method at 100 rpm in 900 ml aqueous buffer (pH between 1.6 and 7.2) at 37°C is between 25% and 60% (by weight) dihydrocodeine released after 1 hour, between 45% and 80% (by weight) dihydrocodeine released after 2 hours, between 60% and 90% (by weight) dihydrocodeine released after 3 hours and between 70% and 100% (by weight) dihydrocodeine released after 4 hours the in vitro release, rate being independent of pH between pH 1.6 and …
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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 September 3, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 3, 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.