Heating element for indirectly heated cathode and method for the

Details Heating element for indirectly heated cathode and method for the Heating element for indirectly heated cathode and method for the

1980-02-09

1984-01-24

Chatmon, Saxfield

Electric lamp and discharge devices

Electrode and shield structures

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

174 52PE, 174110A, 313341, 313345, 501152, H01J 114, H01J 1706, H01K 104

Patent

active

044279167

ABSTRACT:
This heating element is constituted by a filament and a mixture, fritted at between 1700.degree. and 1800.degree. C., of alumina and less than 10% by weight of yttrium oxide. This mixture fills the space left free by the filament within the cylinder closed by an emissive disk forming the cathode.

REFERENCES:
patent: 2975078 (1961-03-01), Rayfield
patent: 3400294 (1968-09-01), Kling
patent: 3803441 (1974-04-01), Ohsawa et al.
patent: 3947373 (1976-03-01), Sobajima et al.
patent: 4150318 (1979-04-01), Kerstetter
patent: 4181532 (1980-01-01), Woodhead
patent: 4331627 (1982-05-01), Yamamoto et al.
patent: 4345111 (1982-08-01), Petitcolas
"Materials and Techniques for Electron Tubes" by Kohl, General Telephone and Electronics Technical Series, pp. 85-89, Mar. 2, 1972.

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