Controlled release pharmaceutical composition
CA 1304684 C · Owner: Martani, Rosa · Inventors: Dumas, Jeanne; Martani, Rosa; Le Huede, Elisabeth
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A solid, controlled release pharmaceutical composition is provided withenhanced levels of control over drug release. The composition comprises an acid addition salt or a quaternary ammonium salt of an oreanic base drug complexed with an anionic surfactant and distributed in a matrix of a hydrophilic polymer. The complex formation between the drug which is preferably an acid addition salt of an organic amine and the surfactant, which is preferably a sulphosuccinate distributed in the hydrophilic, polymer matrix which is preferably a water soluble, hydroxyalkylcellulose ether results in a composition with excellent controlled release characteristics.
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
- Granted July 7, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 7, 2009.
- 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.