Patent US2432944A successfully refreshed from Google Patents.
Patent US2104144A successfully refreshed from Google Patents.
US2104144A
Expired / Lapsed
US
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Airplane door construction
Assignee: Sperry Gyroscope Co Inc
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Filing: 1935-09-26
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Granted: 1938-01-04
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Expires: 1955-09-26
Abstract
No abstract record available.
Inventors
- 👤 Stephen J Zand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:54
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/14; B64C1/1407; B64C1/1423; B60; B60J; B60J10/00; B60J10/20; B60J10/24; B60J10/244; B60J10/80; B60J10/84
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1941-01-03 | 1941-07-05 | 1942-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1945-01-03 | 1945-07-05 | 1946-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1949-01-03 | 1949-07-05 | 1950-01-04 | $7700.00 | Window Closed / Lapsed |