US3594142A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processes for the pelletization of metallurgical slag
Assignee: National Slag Ltd
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Filing: 1968-06-05
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Granted: 1971-07-20
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Expires: 1988-06-05
Abstract
Abstract IN A PROCESS FOR THE PRODUCTION OF GENERALLY-SPHERICAL PELLETS FROM BLAST FURNACE SLAG A STREAM OF MOLTEN SLAG IS MIXED WITH WATER TO INITIATE ITS FOAMING AND/OR EXPANSION; THE SLAG AND WATER MIXTURE FLOWS OVER THE SURFACE OF A COOLED PLATE AND IS THEN PROJECTED INTO THE AIR BY A PROJECTING DEVICE SUCH AS A ROTATING DRUM PROVIDED WITH RADIALLY-EXTENDING CONCAVE VANES; THE MOTION OF THE EXPANED PYROPLASTIC SLAG IN THE AIR CAUSES IT TO FORM SPHERICAL PELLETS THAT ARE SUFFICIENTLY COOLED TO RETAIN THEIR INDIVIDUAL IDENTITIES UPON REACHING THE GROUND.
Inventors
- 👤 Richard D Margesson
- 👤 William G England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:10
CPC Classifications
C; C22; C22B; C22B1/00; C22B1/14; C03; C03B; C03B19/00; C03B19/10; C03B19/1005; C03B19/1015; C03B19/1045; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B3/08; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/024; C21B2400/05; C21B2400/052; C21B2400/056
Claims Analysis
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |