Pressure sensitive adhesives for transdermal absorption formulations
CA 2099273 C · Owner: Hata, Kunihiro · Inventors: Hata, Kunihiro; Shikinami, Yasuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Pressure sensitive adhesives for transdermal absorption formulations comprising a segmented polyurethane, which can control dissolution and a releasing property of drugs of various kinds which are solid at normal temperature; said segment being an alkylene oxide chain which is in a liquid state at a temperature of around normal temperature to around body temperature, and said segment containing a hydrophilic alkylene oxide chain and a hydrophobic alkylene oxide chain, or comprising one or both of them and an alkylene oxide chain in which a hydrophilic moiety and a hydrophobic moiety are present in the mixed manner.
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 2, 1991 and granted March 28, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 2, 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.