Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...
Patent
1974-04-08
1976-03-16
Padgett, Benjamin R.
Electric lamp and discharge devices
Electrode and shield structures
Cathodes containing and/or coated with electron emissive...
313337, 252518, 252521, H01J 114, H01J 1906, H01B 106
Patent
active
039448665
ABSTRACT:
A thermionic emitter for apparatus such as electron microscopes, scanning electron microscopes, and high power vacuum tubes which require a source of electrons formed from lanthanum strontium vanadate which is prepared from the compounds La.sub.(1.sub.-x) Sr.sub.(x) VO.sub.3, where x is the fraction of strontium (Sr) incorporated into LaVO.sub.3. The value of x lies between 0.1 and 0.4.
REFERENCES:
patent: 2639399 (1953-05-01), Lafferty
patent: 3312856 (1967-04-01), Lafferty et al.
patent: 3440475 (1969-04-01), Schiller et al.
patent: 3630770 (1971-12-01), Favreau
Canadian Patents & Development Ltd.
Hughes James R.
Lloyd Josephine
Padgett Benjamin R.
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