US3662058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Utilization of molten slag from metallurgical furnace in manufacture of fused cast refractory shapes
Assignee: SIDERPATENTS SA
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Filing: 1969-01-21
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Granted: 1972-05-09
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Expires: 1989-01-21
Abstract
Abstract DOLOMITE OR MAGNESITE EITHER PREHEATED OR AT ROOM TEMPERATURE IS ADDED DIRECTLY TO THE MOLTEN SLAG IN THE FURNACE DURING THE NORMAL PROCESSING OF A "HEAT" TO RAISE THE MELTING POINT OF THE SLAG-REFRACTORY MIXTURE TO AT LEAST 1800*C. THIS MODIFIED SLAG MIXTURE IS THEN CAST INTO MOLDS TO FORM REFRACTORY SHAPES. GRANULAR REFRACTORY MATERIAL CAN ALSO BE ADDED TO THE MOLD EITHER PRIOR TO OR SIMULTANEOUS WITH THE ADDITION OF THE MODIFIED SLAG.
Inventors
- 👤 Giovanni Crespi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:31
CPC Classifications
C; C04; C04B; C04B5/00; C04B5/06; C04B35/00; C04B35/01; C04B35/03
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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |