US2969826A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for forming compound curvatures in sheet material
Assignee: Individual
•
Filing: 1956-10-03
•
Granted: 1961-01-31
•
Expires: 1976-10-03
Abstract
No abstract record available.
Inventors
- 👤 Earle F Allen
- 👤 Artemas J Haynes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:29
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE265405C
Cited
US382277A
Cited
GB190105357A
Cited
US726691A
Cited
AT46223B
Cited
US1229480A
Cited
US1266470A
Cited
GB125544A
Cited
US1500906A
Cited
US1649613A
Cited
US1990255A
Cited
US2240548A
Cited
US2251901A
Cited
US2269549A
Cited
US2432828A
Cited
US2336535A
Cited
US2301960A
Cited
US2442943A
Cited
US2326470A
Cited
US2479353A
Cited
US2600442A
Cited
US2684528A
Cited
US2697865A
Cited
US2717625A
Cited
US2794409A
Cited
US2792049A
Cited
US2792045A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-01-31 | 1964-08-01 | 1965-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-01-31 | 1968-08-01 | 1969-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-01-31 | 1972-08-01 | 1973-01-31 | $7700.00 | Window Closed / Lapsed |