Method of making pressure sensitive adhesive matrix patches containing hydrophilic salts of drugs
CA 2343100 A1 · Owner: Watson Pharmaceuticals, Inc. · Inventors: Fikstad, David; Venkateshwaran, Srinivasan; Ebert, Charles D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of making a pressure sensitive matrix patch for transdermal delivery of a drug is disclosed. The method includes the steps of dissolving a hydrophilic salt form of the drug in the water phase of an aquesous dispersion of a hydrophobic pressure sensitive adhesive casting the resulting mixture as , a thin film and evaporating the water. The physical stability of the drug in the film is excellent, and crystallization of the drug is inhibited. A method of increasing the transdermal flux of an acidic drug is also disclosed.
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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 September 8, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 8, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 8, 2021.
- 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.