Electric lamp and discharge devices – Electrode and shield structures – Filament or resistance heated electrodes
Reexamination Certificate
2005-03-21
2009-06-09
Roy, Sikha (Department: 2879)
Electric lamp and discharge devices
Electrode and shield structures
Filament or resistance heated electrodes
C313S343000, C313S336000, C313S337000
Reexamination Certificate
active
07545089
ABSTRACT:
A porous cathode structure is fabricated from a plurality of wires which are placed in proximity to each other in elevated temperature and pressure for a sintering time. The sintering process produces the porous cathode structure which may be divided into a plurality of individual porous cathodes, one of which may be placed into a dispenser cathode support which includes a cavity for containing a work function reduction material such as BaO, CaO, and Al2O3. The work function reduction material migrates through the pores of the porous cathode from a work replenishment surface adjacent to the cavity of the dispenser cathode support to an emitting cathode surface, thereby providing a dispenser cathode which has a uniform work function and therefore a uniform electron emission.
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Fundamental Principles of Powder Metallurgy, WO Jones Edward Arnold Publishers 1960.
Falce Louis R.
Ives R. Lawrence
Calabazas Creek Research, Inc.
Chesavage Jay A.
File-EE-Patents.com
Green Tracie Y
Roy Sikha
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