US2807429A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for facilitating the taking off and landing of vertical rising aircraft
Assignee: Lockheed Martin Corp
•
Filing: 1953-11-30
•
Granted: 1957-09-24
•
Expires: 1973-11-30
Abstract
No abstract record available.
Inventors
- 👤 Jr Willis M Hawkins
- 👤 Eugene C Frost
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:56
CPC Classifications
B; B63; B63B; B63B35/00; B63B35/50; B64; B64C; B64C29/00; B64C29/0091; B64C29/02; B64D; B64D5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1625020A
Cited
US2058678A
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US2387762A
Cited
US2358426A
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US2415071A
Cited
US2479125A
Cited
US2712420A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |