Patent US2870936A successfully refreshed from Google Patents.
US2870936A
Expired / Lapsed
US
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Closed system for venting and inerting aircraft fuel tanks
Assignee: Boeing Co
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Filing: 1957-03-18
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Granted: 1959-01-27
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Expires: 1977-03-18
Abstract
No abstract record available.
Inventors
- 👤 Arthur J Clayton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:13
CPC Classifications
B; B64; B64D; B64D37/00; B64D37/02; B64D37/06; B64D37/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1172884A
Cited
US1701870A
Cited
US1567580A
Cited
US1689352A
Cited
US2049987A
Cited
US2640627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |