US3246200A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode including photoconductive and tunneling layers
Assignee: Westinghouse Electric Corp
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Filing: 1962-08-23
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Granted: 1966-04-12
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Expires: 1982-08-23
Abstract
No abstract record available.
Inventors
- 👤 Kanter Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:57
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/34; H01J29/00; H01J29/02; H01J29/10; H01J29/36; H01J29/38; H01J2201/00; H01J2201/34; H01J2201/342; H01J2201/3421; H01J2201/3425
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
AN ELECTRON EMISSIVE DEVICE INCLUDING, A FIRST LAYER COMPRISING A LIGHT TRANSPARENT ELECTRICALLY CONDUCTIVE MATERIAL, A SECOND LAYER DISPOSED ADJACENT SAID FIRST LAYER AND COMPRISING A PHOTOCONDUCTIVE MATERIAL, A THIRD LAYER DISPOSED ADJACENT SAID SECOND LAYER AND COMPRISING AN INSULATING MATERIAL HAVING A FIELD EMISSION CHARACTERISTIC, THE THICKNESS OF SAID THIRD LAYER BEING SELECTED TO PROVIDE A CURRENT-VOLTAGE CHARACTERISTIC HAVING A RELATIVELY LARGE INCREASE IN CURRENT FOR A RELATIVELY SMALL INCREASE IN VOLTAGE, AND A FOURTH LAYER DISPOSED CONTIGUOUS SAID THIRD LAYER COMPRISING MATERIAL HAVING A LOW WORK FUNCTION SURFACE.
Claim 2
Dependent Claim
90 words
AN ELECTRON EMISSIVE DEVICE INCLUDING, A FIRST LAYER COMPRISING A LIGHT TRANSPARENT ELECTRICALLY CONDUCTIVE MATERIAL, A SECOND LAYER DISPOSED ADJACENT SAID FIRST LAYER AND COMPRISING A PHOTOCONDUCTIVE MATERIAL, A THIRD LAYER DISPOSED ADJACENT SAID SECOND LAYER AND COMPRISING AN INSULATING MATERIAL HAVING A FIELD EMISSION CHARACTERISTIC, THE THICKNESS OF SAID THIRD LAYER BEING SELECTED TO PROVIDE A CURRENT-VOLTAGE CHARACTERISTIC HAVING A RELATIVELY LARGE INCREASE IN CURRENT FOR A RELATIVELY SMALL INCREASE IN VOLTAGE, AND A FOURTH LAYER DISPOSED CONTIGUOUS SAID THIRD LAYER COMPRISING MATERIAL HAVING A LOW WORK FUNCTION SURFACE.
References Cited (Backward Citations)
US2970219A
Cited
US2850657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-04-11 | 1969-10-11 | 1970-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-11 | 1973-10-11 | 1974-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-11 | 1977-10-11 | 1978-04-12 | $7700.00 | Window Closed / Lapsed |