Patent US2590902A successfully refreshed from Google Patents.
US2590902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lightweight aggregate from molten slag
Assignee: Tennessee Valley Authority
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Filing: 1951-04-20
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Granted: 1952-04-01
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Expires: 1971-04-20
Abstract
No abstract record available.
Inventors
- 👤 Edgar L Stout
- 👤 Jr William C Scott
- 👤 John M Stinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:46
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B3/08; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/024; C21B2400/05; C21B2400/062; C21B2400/066; C21B2400/072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR EXPANDING SLAG, WHICH COMPRISES CONTINUOUSLY INTRODUCING MOLTEN SLAG INTO THE TOP OF A SHORT, SUBSTANTIALLY VERTICAL CYLINDRICAL ZONE HAVING AN OPEN BOTTOM; CONTROLLING THE RATE OF FLOW OF THE SLAG SO THAT THE CYLINDRICAL ZONE IS KEPT SUBSTANTIALLY FILLED AND SO THAT THE SLAG PASSES DOWNWARD THROUGH SAID ZONE IN ABOUT ONE SECOND; CONCOMITANTLY INTRODUCING AT LEAST ONE STREAM OF WATER INTO SAID ZONE SUBSTANTIALLY TANGENTAILLY AT A VELOCITY SUFFICIENTLY HIGH TO IMPART A SWIRLING MOTION TO THE RESULTING EMULSIONLIKE MIXTURE OF WATER AND MOLTEN SLAG IN SAID ZONE; CONTROLLING THE RATE OF FLOW OF SAID WATER SO THAT THE WALLS OF SAID ZONE ARE KEPT WETTED BY WATER; AND CONTINUOUSLY DROPPING SAID RESULTING MIXTURE FROM THE OPEN BOTTOM OF SAID ZONE INTO A COOLING ZONE.
Claim 2
Dependent Claim
129 words
A PROCESS FOR EXPANDING SLAG, WHICH COMPRISES CONTINUOUSLY INTRODUCING MOLTEN SLAG INTO THE TOP OF A SHORT, SUBSTANTIALLY VERTICAL CYLINDRICAL ZONE HAVING AN OPEN BOTTOM; CONTROLLING THE RATE OF FLOW OF THE SLAG SO THAT THE CYLINDRICAL ZONE IS KEPT SUBSTANTIALLY FILLED AND SO THAT THE SLAG PASSES DOWNWARD THROUGH SAID ZONE IN ABOUT ONE SECOND; CONCOMITANTLY INTRODUCING AT LEAST ONE STREAM OF WATER INTO SAID ZONE SUBSTANTIALLY TANGENTAILLY AT A VELOCITY SUFFICIENTLY HIGH TO IMPART A SWIRLING MOTION TO THE RESULTING EMULSIONLIKE MIXTURE OF WATER AND MOLTEN SLAG IN SAID ZONE; CONTROLLING THE RATE OF FLOW OF SAID WATER SO THAT THE WALLS OF SAID ZONE ARE KEPT WETTED BY WATER; AND CONTINUOUSLY DROPPING SAID RESULTING MIXTURE FROM THE OPEN BOTTOM OF SAID ZONE INTO A COOLING ZONE.
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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |