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US2820214A
Expired / Lapsed
US
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Sonar transducers
Assignee: Individual
•
Filing: 1949-05-28
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Granted: 1958-01-14
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Expires: 1969-05-28
Abstract
No abstract record available.
Inventors
- 👤 John P O'neill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:56
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1394482A
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US1397949A
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US1348826A
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US1705243A
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US1825465A
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AU518331A
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GB395081A
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US2078302A
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US2114680A
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US2430568A
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US2527222A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |