US2687491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrahigh-frequency vacuum tube
Assignee: Individual
•
Filing: 1946-05-15
•
Granted: 1954-08-24
•
Expires: 1966-05-15
Abstract
No abstract record available.
Inventors
- 👤 George H Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:18
CPC Classifications
H; H01; H01J; H01J25/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2272165A
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US2399325A
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US2379818A
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US2409992A
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US2409608A
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US2407707A
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US2433044A
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US2415749A
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US2519443A
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US2511120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-08-23 | 1958-02-22 | 1958-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-08-23 | 1962-02-22 | 1962-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-08-23 | 1966-02-22 | 1966-08-24 | $7700.00 | Window Closed / Lapsed |