Directly heated cathode for electron tube

Details Directly heated cathode for electron tube Directly heated cathode for electron tube

1980-04-25

1982-09-14

Chatmon, Jr., Saxfield

Electric lamp and discharge devices

Electrode and shield structures

Cathodes containing and/or coated with electron emissive...

252513, 252515, 313345, 29 2517, H01J 114, H01J 1906, H01K 104

Patent

active

043497667

ABSTRACT:
A directly heated cathode for electron tube having a stable electron emission characteristic is provided. The cathode comprises a base metal of Ni-W alloy consisting essentially of 20-30% by weight of tungsten, the balance being nickel and incidental impurities, said alloy being free from a reducing agent, and a layer of thermoelectron emission oxides laid directly and baked onto the flat part at the front side of the base metal. The layer of thermoelectron emission oxides is in direct contact with the flat part of the base metal.

REFERENCES:
patent: 2843517 (1958-07-01), Kerstetter et al.
patent: 3351486 (1967-11-01), Buescher et al.
patent: 3374385 (1968-03-01), Lattimer
patent: 3541382 (1970-11-01), Takanaski et al.
patent: 4208208 (1980-06-01), Misumi et al.
patent: 4220891 (1980-09-01), Ando et al.
patent: 4260665 (1981-04-01), Aida et al.
patent: 4279784 (1981-07-01), Misumi et al.
patent: 4310777 (1982-01-01), Fukushima et al.

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