Patent US2364389A successfully refreshed from Google Patents.
US2364389A
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US
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Negative feedback amplifiers
Assignee: STC PLC
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Filing: 1943-11-29
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Granted: 1944-12-05
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Expires: 1963-11-29
Abstract
No abstract record available.
Inventors
- 👤 Roche Alleman Holly
- 👤 Elliott Thomas William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:49
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/16; H03; H03F; H03F1/00; H03F1/34; H03F1/36; H03F1/52; H03F1/54; H03F1/542; H04B; H04B1/00; H04B1/74
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1947-12-05 | 1948-06-05 | 1948-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1951-12-05 | 1952-06-05 | 1952-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1955-12-05 | 1956-06-05 | 1956-12-05 | $7700.00 | Window Closed / Lapsed |