US2569266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rib curving machine
Assignee: National Steel Corp
•
Filing: 1946-10-25
•
Granted: 1951-09-25
•
Expires: 1966-10-25
Abstract
No abstract record available.
Inventors
- 👤 Ralph N Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:04
CPC Classifications
B; B21; B21D; B21D7/00; B21D7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR344057A
Cited
US1810819A
Cited
US1980308A
Cited
US2033424A
Cited
US2336535A
Cited
US2463383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-09-24 | 1955-03-26 | 1955-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-09-24 | 1959-03-26 | 1959-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-09-24 | 1963-03-26 | 1963-09-25 | $7700.00 | Window Closed / Lapsed |