Electron emitting structure and manufacturing method
CA 2060809 A1 · Owner: Raytheon Company · Inventors: Feist, Wolfgang M.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A field emitter includes an electron emitting structure spaced from an anode structure, with the intervening gap being substantially evacuated. The electron emitting structure includes a first electrically conductive layer spaced by an insulating layer from a second conductive layer, and a generally circular aperture disposed through the layers. The anode structure includes an electrically conductive layer. Electrostatic forces provided from a, potential applied between the first conductive layer and the anode structure, causes an electron beam to be drawn from a cathode provided by a peripheral edge portion of the first conductive layer within the aperture onto an adjacent surface portion …
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 February 7, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 7, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 7, 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.