US2455385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternate passage double ring cowl
Assignee: Boeing Co
•
Filing: 1943-02-10
•
Granted: 1948-12-07
•
Expires: 1963-02-10
Abstract
No abstract record available.
Inventors
- 👤 George S Schairer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:18
CPC Classifications
B; B64; B64D; B64D33/00; B64D33/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1412073A
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US1712622A
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US1915298A
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US2077708A
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US2049751A
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GB471639A
Cited
US2087832A
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US2206418A
Cited
US2244594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-07 | 1952-06-07 | 1952-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-07 | 1956-06-07 | 1956-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-07 | 1960-06-07 | 1960-12-07 | $7700.00 | Window Closed / Lapsed |