US3448551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stressed skin panel construction
Assignee: Rheinmetall Air Defence AG
•
Filing: 1967-11-13
•
Granted: 1969-06-10
•
Expires: 1987-11-13
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Heller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:33
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/08; E04C2/30; E04C2/38; E04C2/384; E04B; E04B9/00; E04B9/04; E04B2009/0492
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US948450A
Cited
US1708351A
Cited
US1910608A
Cited
US2350513A
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US2805739A
Cited
US3180220A
Cited
US3267626A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-09 | 1972-12-09 | 1973-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-09 | 1976-12-09 | 1977-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-09 | 1980-12-09 | 1981-06-10 | $7700.00 | Window Closed / Lapsed |