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US2691074A
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Amplifier having frequency responsive variable gain
Assignee: RCA Corp
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Filing: 1949-08-31
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Granted: 1954-10-05
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Expires: 1969-08-31
Abstract
No abstract record available.
Inventors
- 👤 Eberhard Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:52
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/189; H03F3/19; H03F3/191
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2476323A
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US2541322A
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US2550518A
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US2556286A
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US2647957A
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US2647958A
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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) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |