US2556710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Direct lift aircraft
Assignee: Individual
•
Filing: 1945-02-20
•
Granted: 1951-06-12
•
Expires: 1965-02-20
Abstract
No abstract record available.
Inventors
- 👤 Edward A Stalker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:45
CPC Classifications
B; B64; B64C; B64C27/00; B64C27/32; B64C27/325
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1420619A
Cited
FR592393A
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GB370504A
Cited
US2007506A
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US1890519A
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US2380581A
Cited
US2041787A
Cited
US2041789A
Cited
DE625166C
Cited
US2084464A
Cited
US2372030A
Cited
US2408489A
Cited
US2443808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-06-11 | 1954-12-11 | 1955-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-06-11 | 1958-12-11 | 1959-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-06-11 | 1962-12-11 | 1963-06-12 | $7700.00 | Window Closed / Lapsed |