US3259783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indirectly-heated cathode assemblies
Assignee: Thorn A E I Radio Valves & Tub
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Filing: 1964-02-14
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Granted: 1966-07-05
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Expires: 1984-02-14
Abstract
No abstract record available.
Inventors
- 👤 Norris John Albert
- 👤 Watts Albert Trever
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/20
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
120 words
AN INDIRECTLY HEATED CATHODE ASSEMBLY ADAPTED FOR USE IN AN ELECTRON DISCHARGE DEVICE COMPRISING: AN ELECTRICAL HEATER HAVING AN OUTER LAYER OF INSULATING MATERIAL; A HOLLOW CYLINDRICAL CATHODE SURROUNDING AND IN COAXIAL ALIGNMENT WITH SAID HEATER, SAID CATHODE HAVING A LAYER OF POTENTIALLY EMISSIVE MATERIALS ON THE OUTER SURFACE THEREOF; AND A METAL TUBE OF RELATIVELY LOW MASS AND HIGH HOT STRENGTH DISPOSED INTERMEDIATE AND IN COAXIAL ALIGNMENT WITH SAID HEATER AND SAID CATHODE, SAID TUBE SUPPORTING AND ELECTRICALLY INSULATED FROM SAID HEATER AND SPACED FROM SAID CATHODE AND INCLUDING A PLURALITY OF PERFORATIONS SPACED THROUGHOUT THE LONGITUDINAL LENGTH THEREOF AND FORMED TO PROVIDE A PATH FOR ENERGY FLOW IN THE FORM OF HEAT FROM SAID HEATER TO SAID CATHODE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-07-04 | 1970-01-03 | 1970-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-04 | 1974-01-03 | 1974-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-04 | 1978-01-03 | 1978-07-05 | $7700.00 | Window Closed / Lapsed |