US2881994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Convex panel wing construction
Assignee: Northrop Grumman Corp
•
Filing: 1953-11-09
•
Granted: 1959-04-14
•
Expires: 1973-11-09
Abstract
No abstract record available.
Inventors
- 👤 Harold E Michael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:30
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1159720A
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US1817653A
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DE573959C
Cited
GB450395A
Cited
US2167686A
Cited
US2375951A
Cited
US2427853A
Cited
US2473728A
Cited
US2432396A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |