US2549992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifying system for ultra high frequencies
Assignee: Hartford National Bank and Trust Co
•
Filing: 1946-05-01
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Granted: 1951-04-24
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Expires: 1966-05-01
Abstract
No abstract record available.
Inventors
- 👤 Strutt Maximiliaan Julius Otto
- 👤 Ziel Aldert Van Der
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:34
CPC Classifications
H; H01; H01J; H01J43/00; H01J43/02; H01J43/025; H03; H03F; H03F1/00; H03F1/08; H03F1/10; H03F3/00; H03F3/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |