Patent US2947859A successfully refreshed from Google Patents.
US2947859A
Expired / Lapsed
US
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Automatic control of coupling between input tuned circuits to vary attenuation and selectivity
Assignee: Motorola Solutions Inc
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Filing: 1955-08-11
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Granted: 1960-08-02
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Expires: 1975-08-11
Abstract
No abstract record available.
Inventors
- 👤 Angus A Macdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:30
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1638
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2255645A
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US2142038A
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US2145561A
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US2255690A
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US2262707A
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US2210381A
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US2243921A
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US2302893A
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US2714187A
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US2849603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-02 | 1964-02-01 | 1964-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-02 | 1968-02-01 | 1968-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-02 | 1972-02-01 | 1972-08-02 | $7700.00 | Window Closed / Lapsed |