Transdermal drug delivery system
CA 2179894 A1 · Owner: Royds, Robert B. · Inventors: Lim, John; Rosen, Joel D.; Royds, Robert B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In a transdermal drug delivery system (10) encapsulation material used to coat drug granules (24) controls the release of an active ingredient. The active ingredient is released into a water retaining matrix (20), which acts as a reservoir and transdermal drug penetration is driven by the resulting concentration gradient. The delivery system is enclosed in a patch comprising a composite shell (12) which acts as an occlusive covering when attached to skin thus enhancing the hydration of the skin area and fostering absorption of the drug. Visible change indicators (28) incorporated into the system provide indicators at significant "landmarks" in the lifetime of the patch. Microcapsules used …
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 December 9, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 9, 2016.
- 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.