Cathode for cathode ray tube with improved lifetime

Details Cathode for cathode ray tube with improved lifetime Cathode for cathode ray tube with improved lifetime

2008-05-13

2008-05-13

Williams, Joseph L. (Department: 2879)

Electric lamp and discharge devices

Spark plugs

Shaped electrode chamber, insulator end, shell skirt, baffle...

C313S34600R, C313S3460DC

Reexamination Certificate

active

07372192

ABSTRACT:
Impregnated cathode for a vacuum tube comprising an emissive part in the form of a porous pellet impregnated with a compound of alkaline earth metals; the pellet is placed in a dish made of a refractory material and covered with a porous metal foil forming the emissive surface of the cathode. Moreover, the pellet has a separation surface between a heavily impregnated zone and a zone which is not impregnated or weakly impregnated so that the said separation surface comprises at least a hollow part facing the emissive surface. By virtue of the shape of this separation surface, the lifetime of the cathode is improved.

REFERENCES:
patent: 4101800 (1978-07-01), Thomas et al.
patent: 4494035 (1985-01-01), Palluel et al.
patent: 4837480 (1989-06-01), Breeze et al.
patent: 6016026 (2000-01-01), Lee
patent: 6252341 (2001-06-01), Hasegawa et al.
patent: 57-115739 (1982-07-01), None
Patent Abstracts of Japan, vol. 006, No. 211, Oct. 23, 1982 & JP 57-115739 (See Reference AD).
Search Report Dated Feb. 6, 2003.

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