US2931599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug-type doors with integral steps
Assignee: North American Aviation Corp
•
Filing: 1958-03-04
•
Granted: 1960-04-05
•
Expires: 1978-03-04
Abstract
No abstract record available.
Inventors
- 👤 Frederick T Mcquilkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:28
CPC Classifications
B; B64; B64C; B64C1/00; B64C1/24; B64C1/14; B64C1/1407; B64C1/1423; B64C1/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1733887A
Cited
US870498A
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US2137483A
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US2547811A
Cited
US2453937A
Cited
US2558975A
Cited
US2771042A
Cited
US2763900A
Cited
US2751636A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |