US3308335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatically focussed electron image tubes
Assignee: EMI Ltd
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Filing: 1963-03-28
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Granted: 1967-03-07
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Expires: 1983-03-28
Abstract
No abstract record available.
Inventors
- 👤 Mayo Bernard Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:53
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/08; H01J29/46; H01J29/58; H01J29/62; H01J29/622; H01J29/624
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
AN ELECTRON DISCHARGE TUBE COMPRISING (A) AN EVACUATED ENVELOPE, (B) A SUBSTANTIALLY FLAT IMAGE ELECTRON-EMISSIVE SURFACE, (C) A SUBSTANTIALLY FLAT TARGET FOR ELECTRONS EMITTED FROM SAID EMISSIVE SURFACE, SAID SURFACE AND TARGET BETWEEN SPACED ONE FROM THE OTHER, (D) A CONVERGING ELECTROSTATIC FOCUSING MEANS FOR FOCUSING PENCILS OF ELECTRONS EMITTED FROM SAID SURFACE TO FORM AN INVERTED IMAGE ON SAID TARGET, SAID FOCUSING MEANS COMPRISING A PLURALITY OF ANNULAR ELECTRODES AROUND THE ELECTRON OPTICAL PATH FROM SAID EMISSIVE SURFACE TO SAID TARGET, (E) AND AUXILIARY FOCUSING MEANS INCLUDING A MESH PARALLEL TO SAID EMISSIVE SURFACE, SAID MESH HAVING AT LEAST 500 FILAMENTS IN A DISTANCE EQUAL TO THE DIAMETER OR LARGER DIMENSION OF SAID EMISSIVE SURFACE, (F) SAID MESH BEING SPACED FROM SAID EMISSIVE SURFACE BY A DISTANCE NOT EXCEEDING ONE HALF SAID DIAMETER OR LARGER DIMENSION.
Claim 2
Dependent Claim
137 words
AN ELECTRON DISCHARGE TUBE COMPRISING (A) AN EVACUATED ENVELOPE, (B) A SUBSTANTIALLY FLAT IMAGE ELECTRON-EMISSIVE SURFACE, (C) A SUBSTANTIALLY FLAT TARGET FOR ELECTRONS EMITTED FROM SAID EMISSIVE SURFACE, SAID SURFACE AND TARGET BETWEEN SPACED ONE FROM THE OTHER, (D) A CONVERGING ELECTROSTATIC FOCUSING MEANS FOR FOCUSING PENCILS OF ELECTRONS EMITTED FROM SAID SURFACE TO FORM AN INVERTED IMAGE ON SAID TARGET, SAID FOCUSING MEANS COMPRISING A PLURALITY OF ANNULAR ELECTRODES AROUND THE ELECTRON OPTICAL PATH FROM SAID EMISSIVE SURFACE TO SAID TARGET, (E) AND AUXILIARY FOCUSING MEANS INCLUDING A MESH PARALLEL TO SAID EMISSIVE SURFACE, SAID MESH HAVING AT LEAST 500 FILAMENTS IN A DISTANCE EQUAL TO THE DIAMETER OR LARGER DIMENSION OF SAID EMISSIVE SURFACE, (F) SAID MESH BEING SPACED FROM SAID EMISSIVE SURFACE BY A DISTANCE NOT EXCEEDING ONE HALF SAID DIAMETER OR LARGER DIMENSION.
References Cited (Backward Citations)
US2258294A
Cited
US2793319A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-03-06 | 1970-09-05 | 1971-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-06 | 1974-09-05 | 1975-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-06 | 1978-09-05 | 1979-03-07 | $7700.00 | Window Closed / Lapsed |