Patent US2803700A successfully refreshed from Google Patents.
US2803700A
Expired / Lapsed
US
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Signal level control of noise cancellation tube conduction threshold
Assignee: RCA Corp
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Filing: 1952-03-01
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Granted: 1957-08-20
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Expires: 1972-03-01
Abstract
No abstract record available.
Inventors
- 👤 Marlin G Kroger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:31
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/14; H04N5/21; H04N5/213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2265883A
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US2250132A
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US2250144A
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US2301522A
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US2455450A
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US2490025A
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GB631377A
Cited
US2631230A
Cited
US2718552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-08-19 | 1961-02-18 | 1961-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-19 | 1965-02-18 | 1965-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-19 | 1969-02-18 | 1969-08-20 | $7700.00 | Window Closed / Lapsed |