US2585534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Secondary electron emissive electrode and its method of making
Assignee: EMI Ltd
•
Filing: 1946-11-23
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Granted: 1952-02-12
•
Expires: 1966-11-23
Abstract
No abstract record available.
Inventors
- 👤 Bull Cabot Seaton
- 👤 Atherton Albert Horace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:01
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J9/125; H01J1/00; H01J1/02; H01J1/32; H01J2201/00; H01J2201/32; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9265; Y10S428/929; Y10S428/9335; Y10S428/936; Y10S428/938; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/12729; Y10T428/12986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A SECONDARY ELECTRON EMITTING ELECTRODE HAVING A COATING OF A REFRACTORY OXIDE INCLUDING ONE OR MORE OF THE GROUP MAGNESIUM OXIDE, ALUMINIUM OXIDE, AND BERYLIUM OXIDE, COMBINED WITH AN ALKALINE EARTH OXIDE.
Claim 2
Dependent Claim
32 words
A SECONDARY ELECTRON EMITTING ELECTRODE HAVING A COATING OF A REFRACTORY OXIDE INCLUDING ONE OR MORE OF THE GROUP MAGNESIUM OXIDE, ALUMINIUM OXIDE, AND BERYLIUM OXIDE, COMBINED WITH AN ALKALINE EARTH OXIDE.
References Cited (Backward Citations)
US1639698A
Cited
US2134415A
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US2189971A
Cited
US2189358A
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US2198329A
Cited
GB517643A
Cited
US2171227A
Cited
US2317754A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |