Patent US2579528A successfully refreshed from Google Patents.
US2579528A
Expired / Lapsed
US
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Differential electronic amplifier
Assignee: Individual
•
Filing: 1946-03-11
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Granted: 1951-12-25
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Expires: 1966-03-11
Abstract
No abstract record available.
Inventors
- 👤 John E Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:05
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/34; H03F3/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2120823A
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US2164402A
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US2289947A
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US2310342A
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US2412227A
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US2324797A
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US2401447A
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US2383351A
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US2350858A
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US2410081A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |