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US 4,150,318 AGranted
Low mass, indirectly heated, fast warm-up heater-cathode assembly
AssigneeGTE Sylvania Incorporated
InventorDonald R. Kerstetter
Life of this patent
Estimating the term…
Abstract
A substrate of substantially pure, hexagonal crystal, .alpha. alumina (sapphire) has a central hub and three radiating spokes. One surface of the substrate has a metallized cathode base thereon and the opposite surface is provided with a metallized heater. Electrical connection to the cathode base and heater are provided via the spokes, which are also appropriately metallized. A suitable electron emissive material is applied to the cathode base.
Claims5
A low mass, indirectly heated, fast warm-up cathode-heater assembly for an electron discharge device comprising:
- a substrate of substantially pure, hexagonal crystal.alpha.alumina, said substrate having a central hub having three radially extending spokes whose ends terminate at the apices of an equilateral triangle and opposed surfaces;
- a first metallized layer on one of said surfaces covering a substantial part of said hub and one of said spokes;
- and a second metallized layer on an opposite surface and including the other two spokes and a heater section on said hub.
Dependencies are inferred from the claim text.