US3556775A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous oxygen steel making process
Assignee: Individual
•
Filing: 1968-01-03
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Granted: 1971-01-19
•
Expires: 1988-01-03
Abstract
Abstract THIS INVENTION IS TO PROVIDE A PROCESS AND APPARATUS FOR OXIDIZING SUCH IMPURITIES AS CARBON, SILICON, SULFUR AND PHOSPHORUS IN A MOLTEN PIG IRON BY INJECTING OXYGEN FROM THE SIDE OF THE MOLTEN PIG IRON WHILE IT IS BEING MADE TO FLOW DOWN A SERIES OF SHELF MEMBERS IN A VERTICAL REFINING CHAMBER.
Inventors
- 👤 Tatsuo Kuratomi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:55
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/56; C21C5/567; Y; Y10; Y10S; Y10S75/00; Y10S75/957
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) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |