Electric lamp and discharge devices – Electrode and shield structures – Cathodes containing and/or coated with electron emissive...
Patent
1989-11-21
1991-10-22
O'Shea, Sandra L.
Electric lamp and discharge devices
Electrode and shield structures
Cathodes containing and/or coated with electron emissive...
313346DC, H01J 1906
Patent
active
050598562
ABSTRACT:
The lifetime of oxide cathodes comprising, for example BaO and SrO as an emissive material, is improved by adding hafnium oxide or zirconium oxide.
REFERENCES:
patent: 4273683 (1981-06-01), Kawamura
patent: 4291252 (1981-09-01), Aida et al.
patent: 4369392 (1983-01-01), Hotta et al.
patent: 4924137 (1990-05-01), Watanabe et al.
Bartlett Ernestine C.
O'Shea Sandra L.
U.S. Philips Corp.
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