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Patent US2515631A successfully refreshed from Google Patents.
US2515631A
Expired / Lapsed
US
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Apparatus for the production of steel
Assignee: Airco Inc
•
Filing: 1948-03-19
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Granted: 1950-07-18
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Expires: 1968-03-19
Abstract
No abstract record available.
Inventors
- 👤 Haim H Chiswik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:23
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1193783A
Cited
US725786A
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US1475365A
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US1715155A
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US1774486A
Cited
US1812563A
Cited
US2039087A
Cited
US2446511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-07-17 | 1954-01-16 | 1954-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-07-17 | 1958-01-16 | 1958-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-07-17 | 1962-01-16 | 1962-07-18 | $7700.00 | Window Closed / Lapsed |