US3906277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron tube having a semiconductor coated metal anode electrode to prevent electron bombardment stimulated desorption of contaminants therefrom
Assignee: RCA Corp
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Filing: 1972-05-05
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Granted: 1975-09-16
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Expires: 1992-05-05
Abstract
Abstract An electron emissive tube of the type having therein a cesiated cathode, and also having a metal anode electrode. The improvement comprises a thin, clean, non-porous coating of semiconductor material on the surface of the electrode. The coating prevents degradation of the cathode by inhibiting the release of contaminants from the electrode by electron-bombardmentstimulated desorption.
Inventors
- 👤 Horst Ernst Paul Schade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:27
CPC Classifications
H; H01; H01J; H01J29/00; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/34; H01J31/38; H01J31/50; H01J31/505
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
108 words
AN IMPROVED ELECTRON TUBE OF THE TYPE HAVING: A. AN EVACUATED ENVELOPE, B. AN ELECTRON EMITTING CATHODE MOUNTED WITHIN SAID ENVELOPE, SAID CATHODE HAVING A CESIATED LAYER THEREON, C. AT LEAST ONE ELECTRODE IN SAID ENVELOPE FOR CONTROLLING ELECTRON FLOW FROM SAID CATHODE, D. MEANS FOR ENERGIZING ELECTRONS EMITTED FROM SAID CATHODE TO AN ENERGY OF AT LEAST 20 ELECTRON VOLTS, AND E. AT LEAST ONE METAL SURFACE WITHIN SAID ENVELOPE IN THE PATH OF SAID EMITTED ELECTRONS, WHEREIN THE IMPROVEMENT COMPRISES A CLEAN, NONPOROUS COATING OF SEMICONDUCTOR MATERIAL ON SAID METAL SURFACE TO INHIBIT DESORPTION OF GASES FROM SAID SURFACE WHEN SAID SURFACE IS STRUCK BY ELECTRONS.
Claim 2
Dependent Claim
108 words
AN IMPROVED ELECTRON TUBE OF THE TYPE HAVING: A. AN EVACUATED ENVELOPE, B. AN ELECTRON EMITTING CATHODE MOUNTED WITHIN SAID ENVELOPE, SAID CATHODE HAVING A CESIATED LAYER THEREON, C. AT LEAST ONE ELECTRODE IN SAID ENVELOPE FOR CONTROLLING ELECTRON FLOW FROM SAID CATHODE, D. MEANS FOR ENERGIZING ELECTRONS EMITTED FROM SAID CATHODE TO AN ENERGY OF AT LEAST 20 ELECTRON VOLTS, AND E. AT LEAST ONE METAL SURFACE WITHIN SAID ENVELOPE IN THE PATH OF SAID EMITTED ELECTRONS, WHEREIN THE IMPROVEMENT COMPRISES A CLEAN, NONPOROUS COATING OF SEMICONDUCTOR MATERIAL ON SAID METAL SURFACE TO INHIBIT DESORPTION OF GASES FROM SAID SURFACE WHEN SAID SURFACE IS STRUCK BY ELECTRONS.
Claim 3
Dependent Claim
40 words
The tube defined in claim 1 wherein a. said cathode is part of an electron gun which focuses the electrons from said cathode, and b. said metal surface is a metal anode for receiving the electrons from said electron gun.
Claim 4
Dependent Claim
13 words
The tube defined in claim 2 wherein said cathode is a cold cathode.
Claim 5
Dependent Claim
25 words
The tube defined in claim 3 wherein said anode comprises a perforated metal member spaced from said gun and bombarded by electrons from said gun.
Claim 6
Dependent Claim
28 words
The tube defined in claim 1 wherein said cathode is a photocathode, and said metal surface is a metal coating on a phosphor screen spaced from said photocathode.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |