Title:
Rhenium supported metallic boride cathode emitters
United States Patent 3312856

Inventors:
Lafferty, James M.
Grams, William R.
Publication Date:
04/04/1967
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Assignee:
GEN ELECTRIC
Primary Class:
Other Classes:
313/337, 313/311, 313/344, 313/345
International Classes:
H01J1/148; H01J1/13
US Patent References:
2586768Vacuum tube electrode element
2639399Electron emitter
2820920Manufacture of coated electrodes