US2549672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cabin pressure control
Assignee: Douglas Aircraft Co Inc
•
Filing: 1942-05-16
•
Granted: 1951-04-17
•
Expires: 1962-05-16
Abstract
No abstract record available.
Inventors
- 👤 Mar Bruce E Del
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:41
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02; B64D13/04; Y; Y02; Y02T; Y02T50/00; Y02T50/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1562663A
Cited
US2002057A
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US2208554A
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US2265461A
Cited
GB521623A
Cited
US2284984A
Cited
US2407257A
Cited
US2461415A
Cited
US2407258A
Cited
US2407540A
Cited
US2435819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-16 | 1954-10-16 | 1955-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-16 | 1958-10-16 | 1959-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-16 | 1962-10-16 | 1963-04-17 | $7700.00 | Window Closed / Lapsed |