Patent US2623955A successfully refreshed from Google Patents.
US2623955A
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Circuit for amplifying electrical oscillations with a constant amplification factor
Assignee: Hartford National Bank and Trust Co
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Filing: 1948-08-02
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Granted: 1952-12-30
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Expires: 1968-08-02
Abstract
No abstract record available.
Inventors
- 👤 Johannes Jacobus Zaalber Zelst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:46
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/22; B; B60; B60D; B60D1/00; H03F; H03F1/00; H03F1/02; H03F1/04; H03F1/06; H03F1/08; H03F1/52; H03F1/54; H03F3/00; H03F3/38; H03F3/40; H03F3/66
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) | 1955-12-30 | 1956-06-30 | 1956-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-30 | 1960-06-30 | 1960-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-30 | 1964-06-30 | 1964-12-30 | $7700.00 | Window Closed / Lapsed |