Substantially non-swellable contact lens containing block copolymer polysiloxane-polyoxyalkylene backbone units
CA 1293082 C · Owner: Novartis Pharma Canada Inc./Novartis Pharma Canada Inc. · Inventors: Su, Kai Chian; Robertson, J. Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Substantially Non-Swellable Contact Lens Containing Block Copolymer Polysiloxane-Polyoxyalkylene Backbone Units Abstract of the Disclosure, Contact lenses which are optically clear hydrolytically stable, biologically inert wettable, flexible, substantially non-swellable in aqueous ocular tear fluid, oxygen permeable of a block copolymer containing polysiloxane and polyoxyalkylene oxide units are disclosed, as well as the preparation thereof and methods of treating vision defects therewith.
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
- Granted December 10, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 10, 2008.
- 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.