Crosslinked hydrogels derived from hydrophilic polymer backbones
CA 2076492 A1 · Owner: Goldenberg, Merrill S. · Inventors: Rennwantz, Ellen; Goldenberg, Merrill S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the Disclosure, The crosslinked polymerization product of the reaction product of a polymeric backbone containing pendant hydroxyl groups with an unsaturated monoisocyanate or of saidreaction product with an ethylenically unsaturated monomer gives a hydrogel material suitable for making contact lenses.
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 August 20, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended August 20, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 20, 2014.
- 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.