US3371489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous-plug low work-function film cathodes for electron-bombardment ion thrustors
Assignee: Raytheon Co
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Filing: 1964-10-23
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Granted: 1968-03-05
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Expires: 1984-10-23
Abstract
No abstract record available.
Inventors
- 👤 Wilfried O Eckhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:52
CPC Classifications
F; F03; F03H; F03H1/00; F03H1/0037; F03H1/0056; H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J27/00; H01J27/02; H01J27/26
Claims Analysis
Total Claims: 0
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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) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |