US2761637A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite sectional stairway and doorway arrangement for aircraft
Assignee: Blackburn and General Aircraft Ltd
•
Filing: 1953-05-19
•
Granted: 1956-09-04
•
Expires: 1973-05-19
Abstract
No abstract record available.
Inventors
- 👤 Brumby Harold
- 👤 Warburton Dennis Stokes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:27
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1508604A
Cited
US1523715A
Cited
GB262994A
Cited
US2268009A
Cited
US2404195A
Cited
US2531263A
Cited
US2453937A
Cited
US2558975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-04 | 1960-03-05 | 1960-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-04 | 1964-03-05 | 1964-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-04 | 1968-03-05 | 1968-09-04 | $7700.00 | Window Closed / Lapsed |