US2669703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Landing aid
Assignee: Individual
•
Filing: 1952-05-16
•
Granted: 1954-02-16
•
Expires: 1972-05-16
Abstract
No abstract record available.
Inventors
- 👤 Jr John Hays Hammond
- 👤 Albert D Trenor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:22
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/18; B64F1/20; G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |