Patent US2621577A successfully refreshed from Google Patents.
US2621577A
Expired / Lapsed
US
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Cabin pressure change control
Assignee: Boeing Co
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Filing: 1948-10-09
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Granted: 1952-12-16
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Expires: 1968-10-09
Abstract
No abstract record available.
Inventors
- 👤 James B Cooper
- 👤 Alfred B Jepson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:20
CPC Classifications
B; B64; B64D; B64D13/00; B64D13/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2208554A
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US2258054A
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GB521623A
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US2332639A
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US2391197A
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US2450881A
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US2549690A
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US2424491A
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US2463489A
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US2463490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |