Brightness enhancement article
CA 2288093 C · Owner: Fong, Bettie C. · Inventors: Fong, Bettie C.; Kotchick, Keith M.; Williams, Todd R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A brightness enhancement article that includes: (a) a transparent flexible , substrate; (b) a first major surface having an array of prisms with blunted or rounded peaks characterized by a chord whidth cross-sectional pitch width, and radius of curvature in which the chord width is equal to about 20-40 % of the cross-sectional pitch width and the radius of curvature is equal to about 20-50 % of the cross-sectional pitch width; and (c) a second major surface characterized by a plurality of light scattering protrusions. The article has a haze value between about 20-60 % and a transmission value no greater than about 94 % when measured under conditions in which the first surface has a …
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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 May 6, 1998 and granted October 8, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 6, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 6, 2020.
- 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.