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US2446511A
Expired / Lapsed
US
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Open-hearth steelmaking
Assignee: Air Liquide SA
•
Filing: 1947-08-21
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Granted: 1948-08-03
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Expires: 1967-08-21
Abstract
No abstract record available.
Inventors
- 👤 Kerry Frank George
- 👤 Bailey Edward Thomas Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:30
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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US1659869A
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US1718732A
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US1545823A
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US1588634A
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US1955589A
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US1983927A
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US1812563A
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US2039087A
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US2182498A
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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) | 1951-08-03 | 1952-02-02 | 1952-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-03 | 1956-02-02 | 1956-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-03 | 1960-02-02 | 1960-08-03 | $7700.00 | Window Closed / Lapsed |