US3250943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Braided thermionic cathode having emissive material
Assignee: EMI Group Ltd
•
Filing: 1962-02-07
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Granted: 1966-05-10
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Expires: 1982-02-07
Abstract
No abstract record available.
Inventors
- 👤 Antonis Basil
- 👤 Wiltshire Leonard Charles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:23
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/02; H01J61/04; H01J61/06; H01J61/067; H01J61/0672
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A CATHODE STRUCTURE CONSISTING OF A NUMBER OF FINE TUNGSTEN WIRES TO FORM A TUBULAR BRAID WHICH IS FILLED WITH THERMIONICALLY EMISSIVE MATERIAL THROUGHOUT ITS LENGTH WITH THE EXCEPTION OF SHORT TUBULAR END PORTIONS AND MEANS FOR SECURING SAID TUBULAR END PORTIONS TO THE LEAD-IN WIRES.
Claim 2
Dependent Claim
46 words
A CATHODE STRUCTURE CONSISTING OF A NUMBER OF FINE TUNGSTEN WIRES TO FORM A TUBULAR BRAID WHICH IS FILLED WITH THERMIONICALLY EMISSIVE MATERIAL THROUGHOUT ITS LENGTH WITH THE EXCEPTION OF SHORT TUBULAR END PORTIONS AND MEANS FOR SECURING SAID TUBULAR END PORTIONS TO THE LEAD-IN WIRES.
References Cited (Backward Citations)
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US1416623A
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US2161790A
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US2107945A
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US2171238A
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US2246176A
Cited
US2438181A
Cited
US2416661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-05-09 | 1969-11-08 | 1970-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-09 | 1973-11-08 | 1974-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-09 | 1977-11-08 | 1978-05-10 | $7700.00 | Window Closed / Lapsed |