Patent US3331681A successfully refreshed from Google Patents.
US3331681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making steel
Assignee: Dravo Corp
•
Filing: 1964-07-06
•
Granted: 1967-07-18
•
Expires: 1984-07-06
Abstract
No abstract record available.
Inventors
- 👤 Mobley Loreley Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:28
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/02; B; B22; B22D; B22D41/00; B22D41/12; C21C1/06; C21C5/00; C21C5/28; C21C5/285; C21C5/30; C21C5/32; C21C5/42; C21C5/46; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
THE PROCESS FOR EFFECTING CONVERSION OF A FERROUS CHARGE TO STEEL WITH OXYGEN WHICH COMPRISES STATIONING ONE MOBILE FURNACE AT A REFINING STATION AND ENTERING A LANCE THROUGH WHICH A GAS COMPRISING OXYGEN IS INTRODUCED INTO THE FURNACE AT SUCH STATION, POSITIONING ANOTHER SIMILAR MOBILE FURNACE CONTAINING A CHARGE OF SCRAP AT A SECOND STATION IMMEDIATELY BEHIND THE FIRST, WITHDRAWING GASES FROM THE FIRST FURNANCE THROUGH THE SECOND TO PREHEAT THE SCRAP IN THE SECOND, CHARGING MOLTEN METAL INTO THE SECOND FURNACE WHEN THE SCRAP HAS BEEN HEATED AND THE REFINING OPERATION IN THE FIRST IS COMPLETE, ADVANCING THE FIRST FURNACE BEYOND THE FIRST STATION THE REFINING IS COMPLETED, ADVANCING THE SECOND FURNACE TO THE REFINING STATION, AND MOVING A THIRD SIMILAR MOBILE FURNACE TO THE POSITION FORMERLY OCCUPIED BY THE SECOND AND REPEATING THE CYCLE OF REFINING IN ONE FURNACE AND PREHEATING THE SCRAP IN THE SUCCEEDING ONE.
Claim 2
Dependent Claim
149 words
THE PROCESS FOR EFFECTING CONVERSION OF A FERROUS CHARGE TO STEEL WITH OXYGEN WHICH COMPRISES STATIONING ONE MOBILE FURNACE AT A REFINING STATION AND ENTERING A LANCE THROUGH WHICH A GAS COMPRISING OXYGEN IS INTRODUCED INTO THE FURNACE AT SUCH STATION, POSITIONING ANOTHER SIMILAR MOBILE FURNACE CONTAINING A CHARGE OF SCRAP AT A SECOND STATION IMMEDIATELY BEHIND THE FIRST, WITHDRAWING GASES FROM THE FIRST FURNANCE THROUGH THE SECOND TO PREHEAT THE SCRAP IN THE SECOND, CHARGING MOLTEN METAL INTO THE SECOND FURNACE WHEN THE SCRAP HAS BEEN HEATED AND THE REFINING OPERATION IN THE FIRST IS COMPLETE, ADVANCING THE FIRST FURNACE BEYOND THE FIRST STATION THE REFINING IS COMPLETED, ADVANCING THE SECOND FURNACE TO THE REFINING STATION, AND MOVING A THIRD SIMILAR MOBILE FURNACE TO THE POSITION FORMERLY OCCUPIED BY THE SECOND AND REPEATING THE CYCLE OF REFINING IN ONE FURNACE AND PREHEATING THE SCRAP IN THE SUCCEEDING ONE.
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) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |