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Expired Canadian patentCanada

Method of making color screens for fed and other cathodoluminscent displays

CA 2251802 C · Owner: Tello, Felix E. · Inventors: Tello, Felix E.; Libman, Philomena C.

CIPO record

Overview

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

A method for use in the construction of a color display screen using deposition of a plurality of electroluminescent materials onto a substrate bearing said screen. The method comprises the forming operations a) b), and , c) in any sequence: a) forming on the substrate a first screening pattern of deposition sites covered with a first material selectively strippable by a first agent; b) forming on the substrate a second pattern of deposition sites covered with a second material strippable by a second agent; and c) forming on the substrate a matrix surrounding the first and second patterns of deposition sites. The method includes thereafter performing a first stripping of the first …

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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 April 11, 1997 and granted May 28, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 11, 2017.
  • A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 11, 2019.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 11, 1997
GrantedMay 28, 2002
Term endedApril 11, 2017
Patent numberCA 2251802 C
Classification (IPC)H01J9/22 +1 more

Timeline

Timeline From CIPO dates

1998200020022004200620082010201220142016Application filedApril 11, 1997Patent grantedMay 28, 2002Term endedApril 11, 2017

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.