Stabilized sustained release tramadol formulations
CA 2270975 C · Owner: Goldenheim, Paul · Inventors: Huang, Hua-Pin; Oshlack, Benjamin; Goldenheim, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A stabilized sustained release oral solid dosage form which includes an effective amount of tramadol or a pharmaceutically acceptable salt thereof dispersed in a matrix of a hydrophobic material comprising a wax-like substance which was melted or softened during the preparation of the matrix is cured at a temperature from about 35 ~C to about 65 ~C for a time period from about 4 to about 72 hours, such that the formulation when subjected to , in vitro dissolution after exposure to accelerated storage conditions of at least one month at 40 ~C/75 % RH, releases an amount of tramadol which does not vary at any given dissolution time point by more than about 20 % of the total amount of …
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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
- Filed July 2, 1998 and granted April 1, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 2, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 2, 2020.
- 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.