High frequency vacuum tube with closely spaced cathode and non-emissive grid
CA 2124726 C · Owner: Varian Associates, Inc. · Inventors: Shrader, Merrald B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum tube for handling an r.f. signal having a predetermined frequency range comprises a linear electron beam emitting cathode a heater and a non-, electron, emissive current modulating grid. The grid is positioned from the cathode by the, distance an emitted electron from the cathode can travel in a quarter cycle of the r.f. signal. Outer and inner coaxial metal tubes forming a resonant line of a signal, coupler are respectively connected to the grid and cathode so electrons passing, through the grid are in bundles in an interaction region between an accelerating, anode and the grid. Ferrite tiles absorb r.f. fields in the interaction region. In one, embodiment a signal coupling …
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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 May 31, 1994 and granted February 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 31, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 31, 2016.
- 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.