US2549673A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure control system for aircraft cabins
Assignee: Douglas Aircraft Co Inc
•
Filing: 1946-05-13
•
Granted: 1951-04-17
•
Expires: 1966-05-13
Abstract
No abstract record available.
Inventors
- 👤 Mar Bruce E Del
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:14
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02; B64D13/04; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR514055A
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GB521623A
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US2449231A
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US2342220A
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US2307199A
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US2450076A
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US2391197A
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US2450881A
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GB563553A
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US2396116A
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US2407257A
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US2433206A
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US2419707A
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US2407258A
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US2441592A
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US2424491A
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US2407540A
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US2413027A
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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 |