Crosslinked, hydrophilic, highly swellable hydrogels, production thereof and use thereof
CA 2361577 A1 · Owner: Funk, Rudiger · Inventors: Engelhardt, Friedrich; Funk, Rudiger; Herfert, Norbert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to cross-linked, hydrophilic highly swellable hydrogels on the basis of polymerized monomers or on the basis of graft polymers that have a pressure absorbency index of ~100 and a vertical absorption under a pressure of 1922.8 Pa of at least 12 g/g. The invention further relates to a method for producing such hydrogels by radical polymerization of hydrophilic monomers containing acidic groups, their alkali metal or ammonium salts with (a) a copolymerization cross-linking agent which contains at least two ethylenically unsaturated double bonds in the molecule and (b) with a , reactive cross-linking agent A which has an ethylenically unsaturated double bond and at …
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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 January 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 29, 2022.
- 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.