Novel membrane or matrix for controlling drug permeation
CA 2351091 A1 · Owner: Lehtinen, Matti · Inventors: Lehtinen, Matti; Markkula, Tommi; Jukarainen, Harri
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a membrane or matrix made of a siloxane-based , elastomer, and intended for controlling the permeation of drugs wherein said , elastomer comprises 3,3,3,-trifluoropropyl groups attached to the Si-atoms of the siloxane units. The invention relates also to a method for the preparation of a siloxane-based elastomer comprising 3,3,3,-trifluoropropyl substituents wherein said elastomer is intended for controlling the permeation of drugs. In the method either i) a 3,3,3,-trifluoropropyl-substituted vinyl-functional polysiloxane component and a silicon hydride-functional cross-linking agent are cross-linked in the presence of a catalyst or ii) a 3,3,3,-, …
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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 October 26, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 26, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 26, 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.