Patent US3475636A successfully refreshed from Google Patents.
US3475636A
Expired / Lapsed
US
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Liquid-metal arc cathode with maximized electron/atom emission ratio
Assignee: Raytheon Co
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Filing: 1967-11-14
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Granted: 1969-10-28
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Expires: 1987-11-14
Abstract
No abstract record available.
Inventors
- 👤 Wilfried O Eckhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:26
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/04; H01J13/06; H01J27/00; H01J27/02; H05; H05H; H05H1/00; H05H1/24; H05H1/48; H05H1/486; H01J2893/00; H01J2893/0072; H01J2893/0073; H01J2893/0074; H01J2893/0075
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1068615A
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US1596278A
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US1865512A
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US1971805A
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US2594851A
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US3116433A
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US3122882A
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US3163799A
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US3308623A
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US3328624A
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US3371489A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-27 | 1973-04-28 | 1973-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-27 | 1977-04-28 | 1977-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-27 | 1981-04-28 | 1981-10-28 | $7700.00 | Window Closed / Lapsed |