Preparation for transdermal drug administration
CA 2056653 C · Owner: Wyeth K.K. · Inventors: Tokuda, Shoichi; Hori, Mitsuhiko; Saito, Kenichiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a preparation for transdermal drug administration comprising a flexible backing layer and a pressure-sensitive adhesive layer containing a local anesthetic in an amount of 40-65 % by weight based on the total weight of the pressure-sensitive adhesive layer. Since the ratio of the amount of undissolved local anesthetic (Ac) to that of dissolved local anesthetic (As) Ac/As, in the, pressure-sensitive adhesive layer is determined to be in the range of 0.1-1.8, the preparation for transdermal drug administration is superior in self-adhesiveness and leaves no adhesive material upon removal from the skin. In addition burst-like release of the undissolved drug from the …
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 November 29, 1991 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 29, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 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.