US2769230A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating railway car ladders
Assignee: International Steel Co
•
Filing: 1953-06-11
•
Granted: 1956-11-06
•
Expires: 1973-06-11
Abstract
No abstract record available.
Inventors
- 👤 Karl F Nystrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:33
CPC Classifications
B; B21; B21K; B21K7/00; B61; B61D; B61D23/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49938; Y10T29/49943
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US283136A
Cited
US837301A
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US1562419A
Cited
FR648400A
Cited
US1954545A
Cited
US2006925A
Cited
US2473245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-11-06 | 1960-05-07 | 1960-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-06 | 1964-05-07 | 1964-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-06 | 1968-05-07 | 1968-11-06 | $7700.00 | Window Closed / Lapsed |