Electric lamp and discharge devices – Discharge devices having a thermionic or emissive cathode
Reexamination Certificate
2005-09-28
2008-10-28
Prenty, Mark (Department: 2822)
Electric lamp and discharge devices
Discharge devices having a thermionic or emissive cathode
C313S326000
Reexamination Certificate
active
07443090
ABSTRACT:
A surface-emission cathode formed on an insulating surface having cantilevered, i.e. “undercut,” electrodes. Suitable insulating surfaces include negative electron affinity (NEA) insulators such as glass or diamond. The cathode can operate in a comprised vacuum (e.g., 10−7Torr) with no bias on the electrodes and low vacuum electric fields (e.g., at least 10 V cm−1). Embodiments of the present invention are inexpensive to fabricate, requiring lithographic resolution of approximately 10 micrometers. These cathodes can be formed over large areas for use in lighting and displays and are suitable for satellite applications, such as cathodes for tethers, thrusters and space-charging neutralizers.
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Deneault Sandra J.
Fedynyshyn Theodore H.
Geis Michael W.
Krohn Keith E.
Lyszczarz Theodore M.
Goodwin & Procter LLP
Prenty Mark
The Massachusetts Institute of Technology
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