Thermionic cathode and method of manufacturing same
CA 1194089 A · Owner: N.V. Philips Gloeilampenfabrieken · Inventors: Gartner, Georg
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
17, ABSTRACT:, Thermionic cathode and method of manufacturing same. The cathode has a layer structure in which the individual, layers which consist substatially alternately of emitter material (2) and base material (1) are provided at an oblique angle to the macroscopic emitting cathode surface. In a preferred embodiment the surface shows microscopically a stepped structure in which the run-out steps form the continuation of the emitter material layers. In a further embodiment the surface is not stepped but is formed by a polycrystalline or a preferentially oriented polycrystalline coating layer which is provided on the succession of beveled layers. The succession of layers is manufactured …
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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
- Granted September 24, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 24, 2002.
- 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
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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.