Image display
CA 2127442 C · Owner: Shiroishi, Tetsuya · Inventors: Murakami, Hidenobu; Sakurai, Kouichi; Yamane, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is an object of the present invention to provide an image display apparatus which is light and thin and is manufactured with reduced cost and which assures a clear image with no luminance unevenness over the entire screen. The image display apparatus includes: a string like hot cathode for emitting electrons; a perforated cover electrode for leading out and accelerating the electrons emitted from the cathode; a control electrode disposed substantially parallel with the cathode and having an electron-pass aperture permitting an electron beam to pass therethrough, the control electrode being adapted to control the electron beam; a luminous element which emits light when irradiated with the …
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 November 4, 1993 and granted June 13, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 4, 2015.
- 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.