Long-life electron tube device, electron tube cathode, and...

Details Long-life electron tube device, electron tube cathode, and... Long-life electron tube device, electron tube cathode, and...

2005-04-19

2005-04-19

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

Discharge devices having an electrode of particular material

C313S310000, C313S34600R, C313S341000, C313S345000, C313S3460DC

Reexamination Certificate

active

06882093

ABSTRACT:
An electron tube cathode includes an emitter layer30whose main component is barium oxide and that includes a metal and/or a metal oxide as a dopant is formed on a base metal20whose main component is nickel and that includes a reducing agent such as magnesium. A mole ratio of the magnesium, barium, and the dopant is expressed as Y:1000:X. When the X and Y values in are expressed as XY coordinates, the value of X and the value of Y are within a range defined by straight lines connecting points (0.7, (0.8, 15), (3, 130), (3, 30), (2.5, 10), (2, 0.1), and 0.1).

REFERENCES:
patent: 2895854 (1959-07-01), LaRocque
patent: 20020074921 (2002-06-01), Gaertner et al.
patent: 0 841 676 (1998-05-01), None
patent: 1 039 503 (2000-09-01), None
Proceedings of “IDW'00”, Nov. 30, 2000, pp. 517-520.

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