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EP0056749A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Directly heated cathode and method of making it

Assignee: Thales SA
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Filing: 1982-01-08
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Granted: —
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Expires: 2002-01-08
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Abstract

Abstract Translated from French La cathode selon l'invention comporte un support (1) en graphite pyrolytique et un revêtement émissif (2) constitué d'un mélange de tungstène et d'oxyde de lanthane, le tungstène étant transformé dans sa partie superficielle (3) en hemicarbure de tungstène. L'invention s'applique notamment aux tubes haute fréquence du type triode, tétrode ou pentode. The cathode according to the invention comprises a support (1) in pyrolytic graphite and an emissive coating (2) consisting of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part (3) into hemicarbide of tungsten. The invention applies in particular to high frequency tubes of the triode, tetrode or pentode type.

Inventors

  • 👤 Guy Clerc

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-01 14:58
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14

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