Patent US2687777A successfully refreshed from Google Patents.
US2687777A
Expired / Lapsed
US
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Thermionic tube for ultrashort waves
Assignee: Thales SA
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Filing: 1949-07-02
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Granted: 1954-08-31
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Expires: 1969-07-02
Abstract
No abstract record available.
Inventors
- 👤 Warnecke Robert
- 👤 Bernier Jean
- 👤 Guenard Pierre
- 👤 Kleen Werner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:04
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/42; H01J25/44
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2122538A
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US2241976A
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US2414121A
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US2439401A
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US2511407A
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US2566087A
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US2578434A
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US2600509A
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US2531972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-30 | 1958-03-01 | 1958-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-30 | 1962-03-01 | 1962-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-30 | 1966-03-01 | 1966-08-31 | $7700.00 | Window Closed / Lapsed |