US3188197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining hot metal in an electric arc furnace
Assignee: Surahammars Bruks AB
•
Filing: 1962-12-12
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Granted: 1965-06-08
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Expires: 1982-12-12
Abstract
No abstract record available.
Inventors
- 👤 Ostberg Jan-Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:02
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/52; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
A METHOD OF REFINING MOLTEN IRON IN A FURNACE COMPRISING PROVIDING A BATH OF IRON HAVING A PREDETERMINED TEMPERATURE OF AT LEAST 1500*C. AND HAVING A MAXIMUM CARBON CONTENT OF NOT MORE THAN 1.5 PERCENT, CHARGING TO SAID BATH SIMULTANEOUSLY AND SUBSTANTIALLY CONTINUOUSLY MOLTEN PIG IRON AND FERROUS METAL OXIDE ORE AT A RATE SUCH THAT SAID MAXIMUM CARBON CONTENT OF SAID BATH IS NOT EXCEEDED AND THE RATE OF CHANGE OF THE CARBON CONTENT IS LESS THAN 0.3 PERCENT AND THE RATE OF CHANGE OF TEMPERATURE IS LESS THAN 50*C. FOR ANY FIVE MINUTE PERIOD, AND SUPPLYING ELECTRIC POWER TO SAID FURNACE TO MAINTAIN SAID BATH AT SAID PREDETERMINED TEMPERATURE, THEREBY CONVERTING THE IRON INTO STEEL.
Claim 2
Independent Claim
117 words
A METHOD OF REFINING MOLTEN IRON IN A FURNACE COMPRISING PROVIDING A BATH OF IRON HAVING A PREDETERMINED TEMPERATURE OF AT LEAST 1500*C. AND HAVING A MAXIMUM CARBON CONTENT OF NOT MORE THAN 1.5 PERCENT, CHARGING TO SAID BATH SIMULTANEOUSLY AND SUBSTANTIALLY CONTINUOUSLY MOLTEN PIG IRON AND FERROUS METAL OXIDE ORE AT A RATE SUCH THAT SAID MAXIMUM CARBON CONTENT OF SAID BATH IS NOT EXCEEDED AND THE RATE OF CHANGE OF THE CARBON CONTENT IS LESS THAN 0.3 PERCENT AND THE RATE OF CHANGE OF TEMPERATURE IS LESS THAN 50*C. FOR ANY FIVE MINUTE PERIOD, AND SUPPLYING ELECTRIC POWER TO SAID FURNACE TO MAINTAIN SAID BATH AT SAID PREDETERMINED TEMPERATURE, THEREBY CONVERTING THE IRON INTO STEEL.
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) | 1968-06-07 | 1968-12-07 | 1969-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-07 | 1972-12-07 | 1973-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-07 | 1976-12-07 | 1977-06-08 | $7700.00 | Window Closed / Lapsed |