US2481068A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroacoustic translator, including impedance matching
Assignee: Marconi Sounding Device Co Ltd
•
Filing: 1945-11-27
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Granted: 1949-09-06
•
Expires: 1965-11-27
Abstract
No abstract record available.
Inventors
- 👤 Best Frank Powell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2384465A
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US1117766A
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US1121986A
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US1471547A
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US2411541A
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US2427348A
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US2420676A
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US2434666A
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US2423306A
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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) | 1952-09-05 | 1953-03-07 | 1953-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-09-05 | 1957-03-07 | 1957-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-09-05 | 1961-03-07 | 1961-09-06 | $7700.00 | Window Closed / Lapsed |