US2997260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Retractable hydrofoil landing gear for supersonic seaplanes
Assignee: Individual
•
Filing: 1958-12-23
•
Granted: 1961-08-22
•
Expires: 1978-12-23
Abstract
No abstract record available.
Inventors
- 👤 Jr Frederick W S Locke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:53
CPC Classifications
B; B64; B64C; B64C35/00; B64C30/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US811743A
Cited
AT100275B
Cited
US1885881A
Cited
US1906018A
Cited
US2153266A
Cited
US2207735A
Cited
US2936137A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-08-21 | 1965-02-20 | 1965-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-21 | 1969-02-20 | 1969-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-21 | 1973-02-20 | 1973-08-22 | $7700.00 | Window Closed / Lapsed |