US2474652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bending frames pivotally connected by stretch producing hinges
Assignee: UNITED AIRERAFT Corp
•
Filing: 1948-02-18
•
Granted: 1949-06-28
•
Expires: 1968-02-18
Abstract
No abstract record available.
Inventors
- 👤 Emil V Block
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:35
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/02; B27; B27H; B27H1/00
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |