Hydrophilic pressure sensitive adhesive for topical administration of hydrophobic drugs
CA 2067798 A1 · Owner: Medtronic, Inc. · Inventors: Holmblad, Carolann M.; Bergstrom, Joan M.; Bartlett, Terese A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel hydrogel formulations useful as adhesive reservoirs for topical or transdermal drugs employ as the polymer base a crosslinked polymer or copolymer of 2-acrylamido-2-methylpropane sulfonic acid or a salt thereof. The gels are prepared from polymerizable compositions comprising: 20 % - 50 % of a monofunctional monomer component, at least 75 % of said component comprising 2-acrylamido-2-methylpropane sulfonic acid or a salt thereof the balance, being selected from the group consisting of acrylic acid water, soluble acrylic functional monomers and vinyl pyrrolidone; 30 % - 50 % of a glycol component selected from the group consisting of compounds of the formula: HO-(C2H4O)n-H …
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 June 11, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 11, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 11, 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.