EP 0028954 A1 19810520 - Thermionic cathode, process for manufacturing it and electron tube incorporating such a cathode.
Title (en)
Thermionic cathode, process for manufacturing it and electron tube incorporating such a cathode.
Title (de)
Thermoionische Kathode, Verfahren zu ihrer Herstellung und Elektronenröhre mit einer solchen Kathode.
Title (fr)
Cathode thermo-ionique, son procédé de fabrication et tube électronique incorporant une telle cathode.
Publication
Application
Priority
FR 7927715 A 19791109
Abstract (en)
[origin: US4393328A] The hot cathode, according to the invention, is constituted by a fritted matrix 1 and a heating filament 4, said matrix being formed from a powder mixture 2 of tungsten and another high work function refractory metal and covered with a high work function refractory metal film 3. FIG. 3.
Abstract (fr)
La cathode selon l'invention est constituée d'une matrice frittée (1) et d'un filament chauffant (4), la dite matrice étant faite d'un mélange (2) de poudres de tungstène et d'un autre métal réfractaire à haut travail de sortie et recouverte d'un film (3) de métal réfractaire à haut travail de sortie.
IPC 1-7
IPC 8 full level
H01J 1/14 (2006.01); H01J 1/28 (2006.01); H01J 9/04 (2006.01); H01J 23/04 (2006.01); H01J 23/06 (2006.01)
CPC (source: EP US)
H01J 1/14 (2013.01 - EP US); H01J 9/04 (2013.01 - EP US); H01J 23/04 (2013.01 - EP US)
Citation (search report)
- FR 1497992 A 19671013 - PHILIPS NV
- EP 0019992 A1 19801210 - EMI VARIAN LTD [GB]
- GB 1264087 A 19720216
- DE 2720553 A1 19781109 - LICENTIA GMBH
- FR 2063018 A1 19710702 - GEN ELECTRIC
- NL 6701867 A 19680809
- NL 6800278 A 19690711
- NL 6917538 A 19710525
- DE 1639344 A1 19710204 - PHILIPS NV
- FR 2069601 A5 19710903 - PHILIPS NV
- DE 2054698 A1 19711118 - PHILIPS NV
- FR 1555031 A 19690124
- GB 1164413 A 19690917 - PHILIPS ELECTRONIC ASSOCIATED [GB]
- DE 2727187 A1 19771229 - VARIAN ASSOCIATES
- EP 0004424 A1 19791003 - EMI VARIAN LTD [GB]
- SOVIET INVENTIONS ILLUSTRATED Vol. B20, Section R: Electrical, 27 Juin 1979 page SU-R4 (R45) & SU-A-614 475 (9 Aout 1976) * resume en entier *
Designated contracting state (EPC)
DE GB IT NL
DOCDB simple family (publication)
EP 0028954 A1 19810520; FR 2469792 A1 19810522; FR 2469792 B1 19821001; JP S5679830 A 19810630; US 4393328 A 19830712
DOCDB simple family (application)
EP 80401501 A 19801022; FR 7927715 A 19791109; JP 15600380 A 19801107; US 20417680 A 19801105