Patent US2424984A successfully refreshed from Google Patents.
US2565745A
Expired / Lapsed
US
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Navigational aid device
Assignee: Individual
•
Filing: 1948-11-24
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Granted: 1951-08-28
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Expires: 1968-11-24
Abstract
No abstract record available.
Inventors
- 👤 Skalka David
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:52
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2292153A
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US1385776A
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US1919126A
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US2370966A
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US2363600A
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US2350820A
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US2399014A
Cited
US2446845A
Cited
US2425541A
Cited
US2482795A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-27 | 1955-02-26 | 1955-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-27 | 1959-02-26 | 1959-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-27 | 1963-02-26 | 1963-08-28 | $7700.00 | Window Closed / Lapsed |