Patent US2614835A successfully refreshed from Google Patents.
US2614835A
Expired / Lapsed
US
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Mechanism for raising aircraft hangar doors
Assignee: Margison & Babcock
•
Filing: 1949-05-06
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Granted: 1952-10-21
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Expires: 1969-05-06
Abstract
No abstract record available.
Inventors
- 👤 Margison Arthur Donald
- 👤 Craigon Adam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:58
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/50; E05F15/57; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/108
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US621669A
Cited
DE483163C
Cited
US1250992A
Cited
US1530056A
Cited
US2193350A
Cited
US2330005A
Cited
US2440561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-21 | 1956-04-21 | 1956-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-21 | 1960-04-21 | 1960-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-21 | 1964-04-21 | 1964-10-21 | $7700.00 | Window Closed / Lapsed |