Process for making pressure sensitive adhesive hydrogels
CA 2588700 C · Owner: Cotton, Jeffrey D. · Inventors: Cotton, Jeffrey D.; Menon, Vinod P.; Spawn, Terence D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process is provided for preparing a pressure sensitive adhesive hydrogel comprising: (A) providing an oligomeric precursor the oligomeric precursor , comprising a polyether moiety endcapped with ethylenic unsaturation the , oligomeric precursor being associated with methacrylic acid; (B) providing an ethylenically unsaturated crosslinking agent selected from the group consisting of difunctional ethylenically unsaturated monomer trifunctional , ethylenically unsaturated monomer and combinations of the foregoing; (C) free radically curing the oligomeric precursor and the ethylenically unsaturated crosslinking agent in water at a pH between about 3.5 and about 9 to provide the pressure …
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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 11, 2005 and granted April 1, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 11, 2025.
- Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
- 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.