EP 0056749 A3 19820825 - DIRECTLY HEATED CATHODE AND METHOD OF MAKING IT

Title (en)

DIRECTLY HEATED CATHODE AND METHOD OF MAKING IT

Publication

EP 0056749 A3 19820825 (FR)

Application

EP 82400030 A 19820108

Priority

FR 8100782 A 19810116

Abstract (en)

[origin: US4577134A] The invention provides a direct heating thermo-electronic emission cathode comprising a pyrolytic graphite support and an emissive coating formed of a mixture of tungsten and lanthanum oxide, the tungsten being transformed in its surface part into tungsten hermicarbide.

IPC 1-7

H01J 1/14; H01J 9/04

IPC 8 full level

H01J 9/04 (2006.01); H01J 1/14 (2006.01)

CPC (source: EP US)

H01J 1/14 (2013.01 - EP US)

Citation (search report)

[Y] FR 2398381 A1 19790216 - PHILIPS NV [NL]
[Y] FR 2237303 A1 19750207 - BBC BROWN BOVERI & CIE [CH]
[A] EP 0010128 A1 19800430 - SIEMENS AG [DE]
[A] FR 2290025 A1 19760528 - BBC BROWN BOVERI & CIE [CH]
[A] US 4143295 A 19790306 - OGURO TOMOKATSU
[A] FR 2445605 A1 19800725 - THOMSON CSF

Designated contracting state (EPC)

CH DE GB NL

DOCDB simple family (publication)

EP 0056749 A2 19820728; EP 0056749 A3 19820825; EP 0056749 B1 19841017; DE 3260969 D1 19841122; FR 2498372 A1 19820723; FR 2498372 B1 19830722; JP S57138744 A 19820827; US 4577134 A 19860318

DOCDB simple family (application)

EP 82400030 A 19820108; DE 3260969 T 19820108; FR 8100782 A 19810116; JP 351982 A 19820114; US 33887282 A 19820112