Patent US4421574C1 successfully refreshed from Google Patents.
US4421574C1
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Method for suppressing internal oxidation in steel with antimony addition
Assignee: Inland Steel Co
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Filing: 1981-09-08
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Granted: 2002-06-18
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Expires: 2001-09-08
Abstract
No abstract record available.
Inventors
- 👤 Grigory Lyudkovsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:49
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/60; C21; C21D; C21D8/00; C21D8/12; H; H01; H01F; H01F1/00; H01F1/01; H01F1/03; H01F1/12; H01F1/14; H01F1/16; C21D8/1216; C21D8/1233; Y; Y10; Y10S; Y10S148/00; Y10S148/902
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2005-06-17 | 2005-12-17 | 2006-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-06-17 | 2009-12-17 | 2010-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-06-17 | 2013-12-17 | 2014-06-18 | $7700.00 | Window Closed / Lapsed |