Patent DE2919009A1 successfully refreshed from Google Patents.
US2568712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Underwater signaling device
Assignee: Individual
•
Filing: 1947-12-18
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Granted: 1951-09-25
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Expires: 1967-12-18
Abstract
No abstract record available.
Inventors
- 👤 Charles F Bowersett
- 👤 Kenneth L Baker
- 👤 Carl A Axelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:44
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US451598A
Cited
US1314663A
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US1368569A
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US1314662A
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US1418606A
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US1617674A
Cited
US2462305A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |