Method for producing color filter
CA 2066916 A1 · Owner: Yuasa, Hitoshi · Inventors: Nakamura, Toru; Yamasita, Yukio; Sato, Haruyoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for producing a color filter involves (A) forming a photosensitive coating film on an electrically conductive layer formed on a surface of a substrate and, exposing the photosensitive coating film trough a mask having patterns of at least three different degrees of light transmittances; (B) developing and removing a photosensitive coating film portion registering with one of the patterns of smallest and largest degrees of light transmittances for exposing the electrically conductive layer and electrodepositing a colord coating on the exposed electrically conductive layer for forming a colored layer thereon, operation of developing and removing the photosensitive coating film …
Read the whole patent
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 April 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 2014.
- 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.