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Patent US2498527A successfully refreshed from Google Patents.
US2498527A
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Aircraft door
Assignee: Douglas Aircraft Co Inc
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Filing: 1944-12-27
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Granted: 1950-02-21
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Expires: 1964-12-27
Abstract
No abstract record available.
Inventors
- 👤 John B Castle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:16
CPC Classifications
E; E05; E05C; E05C9/00; E05C9/06; E05C9/10; E05C9/16; Y; Y10; Y10T; Y10T292/00; Y10T292/08; Y10T292/0801; Y10T292/0834; Y10T292/0836; Y10T292/0844; Y10T292/096; Y10T292/1014; Y10T292/1022; Y10T292/103
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1580666A
Cited
US1709459A
Cited
US1929341A
Cited
DE661660C
Cited
US2172169A
Cited
US2354297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |