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US 4,055,780 AGranted
Thermionic emission cathode having a tip of a single crystal of lanthanum hexaboride
AssigneeNational Institute for Researches in Inorganic Materials
InventorsShichio Kawai, Takaho Tanaka, Eisuke Bannai, Kenji Uchida, Ryuichi Shimizu
Life of this patent
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Abstract
A single crystal of lanthanum hexaboride is used as a tip of a thermionic emission cathode.
Claims8
A thermionic emission cathode which comprises a tip which includes only a single crystal of lanthanum hexaboride.
Dependencies are inferred from the claim text.