US2417951A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating open-hearth furnaces
Assignee: Republic Steel Corp
•
Filing: 1942-07-22
•
Granted: 1947-03-25
•
Expires: 1962-07-22
Abstract
No abstract record available.
Inventors
- 👤 Elmer A Schwartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:20
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1513828A
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US1904128A
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US1572902A
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US1867221A
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US2021245A
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US2149980A
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US2172105A
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US2362085A
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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) | 1950-03-24 | 1950-09-23 | 1951-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-03-24 | 1954-09-23 | 1955-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-03-24 | 1958-09-23 | 1959-03-25 | $7700.00 | Window Closed / Lapsed |