Ocular lens material and process for producing the same
CA 2262054 C · Owner: Kuraray Co. Ltd. · Inventors: Omura, Ikuo; Makabe, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Ocular lens materials comprising copolymers obtainable by polymerizing a monomer mixture comprising: (A) an N-vinyllactam;, (B) a fluorine-containing unsaturated monomer; (C) a hydrophilic (meth)acrylamide;, (D) a crosslinking agent having at least 2 (meth)acryloyloxy groups; and, (E) a dicarboxylic acid divinyl ester; and ocular lenses comprising these ocular lens materials. The ocular lens materials and ocular lenses according to the present invention causing no elution and having a high water-retaining capability and oxygen permeability, are excellent in transparency resistance to deposition, mechanical strength flexibility, safety, durability, ability of correcting visual acuity comfort …
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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 February 16, 1999 and granted March 11, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 16, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 16, 2021.
- 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
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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.