Patent US3004104A successfully refreshed from Google Patents.
US3004104A
Expired / Lapsed
US
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Identification of sound and like signals
Assignee: MUZAK Corp
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Filing: 1954-04-29
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Granted: 1961-10-10
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Expires: 1974-04-29
Abstract
No abstract record available.
Inventors
- 👤 Hembrooke Emil Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:09
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/00086; G01; G01H; G01H3/00; G11B20/00884; G11B20/00891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2398755A
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US2406034A
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US2376275A
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US2580973A
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US2503701A
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US2636936A
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US2474191A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |