US2914690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron-emitting surfaces and methods of making them
Assignee: RCA Corp
•
Filing: 1955-12-05
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Granted: 1959-11-24
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Expires: 1975-12-05
Abstract
No abstract record available.
Inventors
- 👤 Sommer Alfred Hermann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:59
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/12; H01J1/00; H01J1/02; H01J1/34; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J2201/00; H01J2201/34; H01J2201/342; H01J2201/3421; H01J2201/3426
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
AN ELECTRON-EMISSIVE ELECTRODE COMPRISING A SUPPORTING BASE, A FILM OF POTASSIUM ON SAID BASE, A FILM OF ANTIMONY ON SAID POTASSIUM FILM, SAID ANTIMONY FILM INCLUDING REACTION PRODUCTS OF ANTIMONY WITH A PLURALITY OF ALKALI METALS.
Claim 2
Dependent Claim
36 words
AN ELECTRON-EMISSIVE ELECTRODE COMPRISING A SUPPORTING BASE, A FILM OF POTASSIUM ON SAID BASE, A FILM OF ANTIMONY ON SAID POTASSIUM FILM, SAID ANTIMONY FILM INCLUDING REACTION PRODUCTS OF ANTIMONY WITH A PLURALITY OF ALKALI METALS.
References Cited (Backward Citations)
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Cited
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Cited
US2654048A
Cited
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Cited
US2770561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-11-23 | 1963-05-25 | 1963-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-11-23 | 1967-05-25 | 1967-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-11-23 | 1971-05-25 | 1971-11-24 | $7700.00 | Window Closed / Lapsed |