US2631241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuning device for high-frequency electrical energy
Assignee: Allen B du Mont Laboratories Inc
•
Filing: 1949-04-23
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Granted: 1953-03-10
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Expires: 1969-04-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Fred W Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:14
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/54; H01; H01F; H01F21/00; H01F21/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1660108A
Cited
US2093750A
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US2341346A
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US2438912A
Cited
GB604652A
Cited
US2537052A
Cited
US2477749A
Cited
US2475637A
Cited
US2554295A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-09 | 1956-09-08 | 1957-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-09 | 1960-09-08 | 1961-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-09 | 1964-09-08 | 1965-03-10 | $7700.00 | Window Closed / Lapsed |