Transdermal device
CA 2093321 C · Owner: Ethical Pharmaceuticals Limited · Inventors: Jenkins, Anthony William
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of preparing a device for transdermal delivery of an active ingredient which is solid at room temperature and in which part or all of the active ingredient is present in a supersaturated solution is provided in which as a first step a mixture is prepared which includes at least a polymer adhesive a vehicle for the polymer adhesive, the active ingredient and a solvent mixture for the active ingredient comprising at least two solvents. The mixture is formed into a film and dried. The vehicle for the polymer adhesive and at least one of the solvents in the solvent mixture for the active ingredient have boiling points below the drying temperature while at least one of the solvents in …
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 October 4, 1991 and granted November 24, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 4, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2013.
- 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.