Electric lamp and discharge devices – Discharge devices having a multipointed or serrated edge...
Reexamination Certificate
2005-06-07
2005-06-07
Glick, Edward J. (Department: 2882)
Electric lamp and discharge devices
Discharge devices having a multipointed or serrated edge...
C313S351000, C313S446000, C313S337000
Reexamination Certificate
active
06903499
ABSTRACT:
An electron gun includes an electron emission cathode, a control electrode, and an extractor and the electron emission cathode is made of rare earth hexaboride. A tip of the electron emission cathode is located between the control electrode and the extractor, and the electron emission surface of the electron emission cathode is spherical or flat.
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Hirokawa Shinpei
Terui Yoshinori
Tsunoda Katsuyoshi
Denki Kagaku Kogyo Kabushiki Kaisha
Glick Edward J.
Keaney Elizabeth
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
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