US2757354A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Echo locating systems using sonic or supersonic pulses
Assignee: ELAC Electroacustic GmbH
•
Filing: 1950-07-19
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Granted: 1956-07-31
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Expires: 1970-07-19
Abstract
No abstract record available.
Inventors
- 👤 Bolzmann Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:29
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB236601A
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US1983254A
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US2143035A
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US2471408A
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US2454782A
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US2556212A
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US2399017A
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US2461998A
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US2568441A
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US2600335A
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US2552022A
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US2504852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-07-31 | 1960-01-30 | 1960-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-31 | 1964-01-30 | 1964-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-31 | 1968-01-30 | 1968-07-31 | $7700.00 | Window Closed / Lapsed |