Colored plastic lens and method of manufacture therefor
CA 2118738 C · Owner: Kawamura, Yuko · Inventors: Ono, Ichiro; Kawamura, Yuko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A colored plastic lens includes a plastic substrate having first and second surfaces, a resin film with a pigment dispersed therein formed on one of the first and second, surfaces of the plastic substrate and a coating film, preferably a hard coat film, formed, on one of the resin film and the surface of the lens on which the resin film is not, formed. A method of forming the colored plastic lens includes providing a plastic, substrate having first and second sides dispersing a pigment in a resin , vehicle coating, the pigment dispersed in the resin vehicle on one of the first and second sides of the, plastic substrate to thereby form a resin film and forming a coating film, …
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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 March 10, 1994 and granted May 20, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 10, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 10, 2016.
- 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.