US2538519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Keyed automatic gain control circuit with double time constant input voltage filter
Assignee: Avco Manufacturing Corp
•
Filing: 1949-06-23
•
Granted: 1951-01-16
•
Expires: 1969-06-23
Abstract
No abstract record available.
Inventors
- 👤 Paul F G Holst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:47
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/52; H04N5/53
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2227056A
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FR845897A
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FR851899A
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US2266731A
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US2307375A
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US2230295A
Cited
US2300942A
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US2402096A
Cited
US2498839A
Cited
US2520012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |