Electron-emitting device, and electron beam lithography machine and image display apparatus making use of it
CA 2013233 C · Owner: Canon Kabushiki Kaisha · Inventors: Yanagisawa, Yoshihiro; Takimoto, Kiyoshi; Morikawa, Yuko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An electron-emitting device comprises a substrate an electrode provided on said substrate an insulating, layer laminated on the electrode and a second electrode, having an opening and laminated on the insulating layer in such a manner that the insulating layer is uncovered at the opening and electrons are emitted from the opening of the second electrode as a result of application of an voltage between the electrodes. An image display apparatus comprises the electron-emitting device a, modulating electrode capable of modulating an electron beam emitted from the electron-emitting device in, accordance with an information signal and an image, forming member capable of forming an image as 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 March 28, 1990 and granted January 16, 1996. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 28, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 28, 2012.
- 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.