Patent FR1568971A successfully refreshed from Google Patents.
Patent US2512889A successfully refreshed from Google Patents.
US2512889A
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US
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Electroacoustic apparatus
Assignee: Individual
•
Filing: 1945-03-20
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Granted: 1950-06-27
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Expires: 1965-03-20
Abstract
No abstract record available.
Inventors
- 👤 Dreyfus Jean Albert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:05
CPC Classifications
G; G10; G10L; G10L15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1712113A
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US1951454A
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US2186895A
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US2154441A
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US2186897A
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US2151091A
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US2186896A
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US2133811A
Cited
US2195081A
Cited
US2403997A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-06-26 | 1953-12-26 | 1954-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-06-26 | 1957-12-26 | 1958-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-06-26 | 1961-12-26 | 1962-06-27 | $7700.00 | Window Closed / Lapsed |