Optical film and polarizing film using the same, and method for improving view angle of the polarizing film
CA 2678211 A1 · Owner: Polatechno Co. Ltd. · Inventors: Tanaka, Kouichi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides an optical film prepared by laminating at least one of a first retardation film (2) having , a mean in-plane refractive index of no and refractive index in the thickness direction of n e wherein n e - n o > 0 and at least , one of a second retardation film (3) having an in-plane refractive index of n x in the direction showing the maximum refractive index, refractive index of n y in the direction perpendicular to the direction described just before and , refractive index in the thickness direction of n z wherein n x > n y >= n z. The light leakage occurred as the observation point is tilted from the front direction to a direction different from the direction …
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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 December 17, 2001. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 17, 2021.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 17, 2023.
- 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.