US3753023A
Expired / Lapsed
US
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Electron emissive device incorporating a secondary electron emitting material of antimony activated with potassium and cesium
Assignee: RCA Corp
•
Filing: 1971-12-03
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Granted: 1973-08-14
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Expires: 1991-12-03
Abstract
Abstract In an electron emissive device having electron multiplying dynodes, the dynode surfaces upon which the electrons impinge are provided with a layer of antimony activated with cesium and potassium.
Inventors
- 👤 A Sommer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:51
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/04; H01J1/00; H01J1/02; H01J1/32
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
The device defined in claim 1 and wherein said secondary-electron-emitting material is superficially oxidized.
Claim 2
Dependent Claim
16 words
The device defined in claim 1 and wherein said means for emitting electrons is a photocathode.
Claim 3
Dependent Claim
25 words
The device defined in claim 3 and wherein said photocathode comprises at least one alkali metal chosen from the group consisting of potassium and cesium.
Claim 4
Dependent Claim
19 words
The device defined in claim 4 wherein said photocathode and said secondary-electron-emitting material have substantially the same chemical composition.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |