US4150318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low mass, indirectly heated, fast warm-up heater-cathode assembly
Assignee: GTE Sylvania Inc
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Filing: 1978-04-17
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Granted: 1979-04-17
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Expires: 1998-04-17
Abstract
Abstract A substrate of substantially pure, hexagonal crystal, α 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.
Inventors
- 👤 Donald R. Kerstetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:40
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/24
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
89 words
A low mass, indirectly heated, fast warm-up cathode-heater assembly for an electron discharge device comprising: a substrate of substantially pure, hexagonal crystalαalumina, 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.
Claim 2
Dependent Claim
89 words
A low mass, indirectly heated, fast warm-up cathode-heater assembly for an electron discharge device comprising: a substrate of substantially pure, hexagonal crystalαalumina, 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.
Claim 3
Dependent Claim
12 words
The assembly of claim 1 wherein said spoke termini are substantially circular.
Claim 4
Dependent Claim
10 words
The assembly of claim 2 wherein said termini are apertured.
Claim 5
Dependent Claim
19 words
The assembly of claim 1 wherein said first metallized layer on said hub has thereon an electron emissive material.
Claim 6
Dependent Claim
22 words
The assembly of claim 3 wherein said apertures contain electrical leads connected to said layers to supply appropriate voltages to said layers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-16 | 1982-10-16 | 1983-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-16 | 1986-10-16 | 1987-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-16 | 1990-10-16 | 1991-04-17 | $7700.00 | Window Closed / Lapsed |