Back to results
US 4,308,178 AGranted
Thermionic cathode emitter coating
AssigneeNorth American Philips Consumer Electronics Corp.
InventorsHarry J. Fromell, Philip W. Ghaner
Life of this patent
Estimating the term…
Abstract
Emission quantity of thermionic cathodes is increased by including in the potentially emissive material applied to a cathode substrate a quantity of a readily reducible metallic oxide. During cathode processing the metal oxide provides free oxygen gas which aids in binder removal.
Claims1
A potentially electron emissive material for electron discharge devices consisting essentially of:
- barium carbonate and at least one carbonate selected from the group of calcium and strontium;
- an organic binder;
- nickel powder;
- and nickelous oxide;
- said nickel powder being present in an amount of from about 5% to about 20% by weight of said carbonates;
- and said nickelous oxide being present in an amount of from about 10% to 25% by weight of said nickel, said nickelous oxide providing free oxygen during subsequent processing of said material.
3 more elements
Dependencies are inferred from the claim text.