Patent US3230075A successfully refreshed from Google Patents.
US3230075A
Expired / Lapsed
US
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Method for nitrogen-enrichment of molten steel covered with slag
Assignee: IHI Corp
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Filing: 1963-05-08
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Granted: 1966-01-18
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Expires: 1983-05-08
Abstract
No abstract record available.
Inventors
- 👤 Nakamura Hajime
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:56
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0037; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/4613; C22; C22C; C22C33/00; C22C33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |