US2660689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrahigh-frequency vacuum tube
Assignee: International Standard Electric Corp
•
Filing: 1948-06-17
•
Granted: 1953-11-24
•
Expires: 1968-06-17
Abstract
No abstract record available.
Inventors
- 👤 Touraton Emile
- 👤 Zwobada Rene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:31
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2064469A
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US2300052A
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US2367295A
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US2395560A
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US2409992A
Cited
US2575383A
Cited
US2578434A
Cited
US2541843A
Cited
US2516944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |