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US3479551A
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US
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Electron emitting cathodes having a flexible graphite filament with an emissive coating thereon
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1967-09-25
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Granted: 1969-11-18
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Expires: 1987-09-25
Abstract
No abstract record available.
Inventors
- 👤 John David Mccann
- 👤 Robin Walter Ellecker Fuller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:37
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2563573A
Cited
US638838A
Cited
US1701356A
Cited
US2083196A
Cited
US2246176A
Cited
FR1382015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-17 | 1973-05-19 | 1973-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-17 | 1977-05-19 | 1977-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-17 | 1981-05-19 | 1981-11-18 | $7700.00 | Window Closed / Lapsed |