Patent US3140419A successfully refreshed from Google Patents.
US3140419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge tube having an anode with cavities
Assignee: NORTH AMERICAN PHILLIPS COMPAN
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Filing: 1961-05-26
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Granted: 1964-07-07
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Expires: 1981-05-26
Abstract
No abstract record available.
Inventors
- 👤 Poel Jan Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:22
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0013
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
AN ELECTRIC DISCHARGE TUBE COMPRISING AN ELECTRODE SYSTEM INCLUDING A CATHODE HAVING AN EMISSIVE SURFACE, AT LEAST TWO GRID ELECTRODES, AND AN ANODE HAVING PARTITIONS FACING THE CATHODE AND DEFINING ELECTRON PATHS WITH THE CATHODE ELECTRON EMISSIVE SURFACE, SAID ANODE COMPRISING A FIRST BOX-SHAPED INNER PART OF CROSS-SHAPED CROSS-SECTION, THE FACES OF THE INNER PART AT RIGHT ANGLES TO THE ELECTRON PATHS BEING PROVIDED WITH APERTURES THEREIN, A SECOND BOX-SHAPED OUTER PART SUPPORTED BY AND SURROUNDING THE INNER PART, SAID OUTER PART COMPRISING TWO HALVES JOINED TOGETHER WITH CONNECTING EDGES LYING IN A PLANE OF SYMMETRY OF THE ELECTRODE SYSTEM AT RIGHT ANGLES TO THE CATHODE ELECTRON EMISSIVE SURFACE, THE END SURFACES OF THE CROSS OF THE CROSS-SHAPED SECTION OF THE OUTER PART AT RIGHT ANGLES TO THE ELECTRON PATHS BEING WIDER THAN THE END SURFACES OF THE CORRESPONDING ARMS OF THE CROSSSHAPED SECTION OF THE INNER PART.
Claim 2
Dependent Claim
148 words
AN ELECTRIC DISCHARGE TUBE COMPRISING AN ELECTRODE SYSTEM INCLUDING A CATHODE HAVING AN EMISSIVE SURFACE, AT LEAST TWO GRID ELECTRODES, AND AN ANODE HAVING PARTITIONS FACING THE CATHODE AND DEFINING ELECTRON PATHS WITH THE CATHODE ELECTRON EMISSIVE SURFACE, SAID ANODE COMPRISING A FIRST BOX-SHAPED INNER PART OF CROSS-SHAPED CROSS-SECTION, THE FACES OF THE INNER PART AT RIGHT ANGLES TO THE ELECTRON PATHS BEING PROVIDED WITH APERTURES THEREIN, A SECOND BOX-SHAPED OUTER PART SUPPORTED BY AND SURROUNDING THE INNER PART, SAID OUTER PART COMPRISING TWO HALVES JOINED TOGETHER WITH CONNECTING EDGES LYING IN A PLANE OF SYMMETRY OF THE ELECTRODE SYSTEM AT RIGHT ANGLES TO THE CATHODE ELECTRON EMISSIVE SURFACE, THE END SURFACES OF THE CROSS OF THE CROSS-SHAPED SECTION OF THE OUTER PART AT RIGHT ANGLES TO THE ELECTRON PATHS BEING WIDER THAN THE END SURFACES OF THE CORRESPONDING ARMS OF THE CROSSSHAPED SECTION OF THE INNER PART.
References Cited (Backward Citations)
US2878408A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |