Patent US4308178A successfully refreshed from Google Patents.
US4308178A
Expired / Lapsed
US
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Thermionic cathode emitter coating
Assignee: Philips North America LLC
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Filing: 1979-09-17
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Granted: 1981-12-29
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Expires: 1999-09-17
Abstract
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.
Inventors
- 👤 Harry J. Fromell
- 👤 Philip W. Ghaner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:31
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
87 words
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.
Claim 2
Dependent Claim
87 words
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.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-12-28 | 1985-06-29 | 1985-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-28 | 1989-06-29 | 1989-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-28 | 1993-06-29 | 1993-12-29 | $7700.00 | Window Closed / Lapsed |