US2598326A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative feedback amplifier
Assignee: EMI Ltd
•
Filing: 1947-11-18
•
Granted: 1952-05-27
•
Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 White Eric Lawrence Casling
- 👤 Newman Edward Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:47
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/42; H03F1/48; H03F1/50; H03F1/34; H03F1/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2120823A
Cited
US2235190A
Cited
US2293449A
Cited
US2302798A
Cited
US2352956A
Cited
US2356331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-05-27 | 1955-11-26 | 1956-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-27 | 1959-11-26 | 1960-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-27 | 1963-11-26 | 1964-05-27 | $7700.00 | Window Closed / Lapsed |