US3131328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dispenser cathode for cathode ray tube
Assignee: General Dynamics Corp
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Filing: 1960-06-20
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Granted: 1964-04-28
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Expires: 1980-06-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph T Mcnaney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:47
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/16
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
IN A CATHODE RAY DISPLAY TUBE WHEREIN AN ELECTRON BEAM SHAPED INTO A PLURALITY OF INDIVIDUAL SPACED CHARACTER-LIKE CROSS-SECTIONS IS PROJECTED ALONG THE TUBE TOWARD ITS SCREEN, AND WHEREIN ONE OF THESE CROSS-SECTIONS IS SELECTED FOR IMPINGEMENT UPON THE SCREEN, THE COMBINATION COMPRISING: A CATHODE BODY HAVING ELECTRON EMITTING SURFACES PREFORMED INTO A PLURALITY OF INDIVIDUAL SPACED CHARACTER-LIKE CROSS-SECTIONS, THE ELECTRONS FROM SAID EMITTING SURFACES FORMING SAID ELECTRON BEAM; MEANS POSITIONED OVER THE NONFORMED PORTIONS OF SAID CATHODE BODY FOR PREVENTING ELECTRON EMISSION FROM AREAS OTHER THAN THE PLURALITY OF CHARACTER-LIKE CROSS-SECTIONS; AND HEATER MEANS ADJACENT SAID CATHODE BODY FOR INDIRECTLY HEATING SAID CATHODE BODY.
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) | 1967-04-28 | 1967-10-28 | 1968-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-28 | 1971-10-28 | 1972-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-28 | 1975-10-28 | 1976-04-28 | $7700.00 | Window Closed / Lapsed |