Method of treating electron emissive cathodes

Details Method of treating electron emissive cathodes Method of treating electron emissive cathodes

1974-08-13

1976-07-13

Padgett, Benjamin R.

Compositions

Electrically conductive or emissive compositions

Metal compound containing

252500, 313346R, H01B 108

Patent

active

039692795

ABSTRACT:
Firing electron emissive compounds of barium tantalate in excess of 1600.degree.C in controlled vacuum conditions removes elemental barium from the compound. The method provides improved fluorescent lamp quality by yielding substantially less end discoloration over the life of the lamps.

REFERENCES:
patent: 2917415 (1959-12-01), Levi
patent: 3017365 (1962-01-01), Harrison
patent: 3441438 (1969-04-01), Weiss
patent: 3597271 (1971-08-01), Cawley et al.
patent: 3642527 (1972-02-01), Purdes et al.
patent: 3718831 (1973-02-01), Butter et al.
patent: 3766423 (1973-10-01), Menelly
patent: 3842469 (1974-10-01), Menelly

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