Patent US2444218A successfully refreshed from Google Patents.
US2444218A
Expired / Lapsed
US
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Frequency-modulated radio-phonograph combination
Assignee: Zenith Electronics LLC
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Filing: 1941-08-11
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Granted: 1948-06-29
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Expires: 1961-08-11
Abstract
No abstract record available.
Inventors
- 👤 Chalon W Carnahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:47
CPC Classifications
H; H04; H04R; H04R19/00; H04R19/04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2112010A
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US1939940A
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US1968149A
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US2229640A
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US2060611A
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US2250532A
Cited
US2276562A
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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) | 1951-06-29 | 1951-12-29 | 1952-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-29 | 1955-12-29 | 1956-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-29 | 1959-12-29 | 1960-06-29 | $7700.00 | Window Closed / Lapsed |