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US2517779A
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US
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Aircraft landing instrument having an optical sight
Assignee: Individual
•
Filing: 1946-10-03
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Granted: 1950-08-08
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Expires: 1966-10-03
Abstract
No abstract record available.
Inventors
- 👤 Earl E Flint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/02; G02B23/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2336809A
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GB191229669A
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US1664409A
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US1963826A
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US2031601A
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US2280126A
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US2384036A
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US2412585A
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US2367207A
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US2424088A
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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) | 1953-08-07 | 1954-02-06 | 1954-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-08-07 | 1958-02-06 | 1958-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-08-07 | 1962-02-06 | 1962-08-08 | $7700.00 | Window Closed / Lapsed |