Patent US2412647A successfully refreshed from Google Patents.
US2412647A
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US
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Aircraft
Assignee: Northrop Grumman Corp
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Filing: 1944-08-08
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Granted: 1946-12-17
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Expires: 1964-08-08
Abstract
No abstract record available.
Inventors
- 👤 John K Northrop
- 👤 William R Sears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:40
CPC Classifications
B; B64; B64C; B64C39/00; B64C39/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-12-16 | 1950-06-17 | 1950-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-12-16 | 1954-06-17 | 1954-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-12-16 | 1958-06-17 | 1958-12-17 | $7700.00 | Window Closed / Lapsed |