Soft contact lens composition and method
CA 1136306 A · Owner: Toray Industries, Inc. · Inventors: Ohkado, Shinzo; Kenjo, Hideki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An original solution for producing a soft contact lens by a direct casting method is disclosed. The original solution contains: a component A selected from the group consisting of monomers and post cross-linkable hydrophillic polymers wherein the monomers yield hydrophillic component when polymerized; a component B selected from the group consisting of monomers and postcross-linkable hydrophobicpolymers wherein the monomers yield hydrophobic component when polymerized; and a suitable solvent C. The weight ratio of A:B is from about 85:15 to about 55:45 and the amount of solvent C is about 5 to 95% by weight at least one of, the components A and B is a post cross-linkable polymer. This …
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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
- Granted November 23, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 1999.
- 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.