Patent US419920A successfully refreshed from Google Patents.
US2590901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of lightweight aggregate from molten slag
Assignee: Tennessee Valley Authority
•
Filing: 1951-04-20
•
Granted: 1952-04-01
•
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 08:45
CPC Classifications
C; C21; C21B; C21B3/00; C21B3/04; C21B3/06; C21B2400/00; C21B2400/02; C21B2400/022; C21B2400/024; C21B2400/034; C21B2400/05; C21B2400/062; C21B2400/066; C21B2400/072; Y; Y02; Y02W; Y02W30/00; Y02W30/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A PROCESS FOR EXPANDING MOLTEN SLAG PRODUCED BY SMELTING PHOSPHATE ROCK, WHICH COMPRISES INTRODUCING A STREAM OF SUCH SLAG AT A TEMPERATURE OF NOT LESS THAN 1350* C. INTO AN EXPANSION ZONE HAVING A LAYER OF INERT GRANULAR MATERIAL PREVIOUSLY SATURATED WITH WATER IN THE BOTTOM THEREOF; CONTROLLING THE RATE OF FLOW OF SAID SLAG IN THE RANGE FROM 90 TO 245 POUNDS PER MINUTE PER CUBIC FOOT OF EFFECTIVE EXPANSION SPACE IN SAID ZONE; INTRODUCING AT LEAST ONE STREAM OF WATER INTO SAID STREAM OF SLAG AT A POINT BENEATH THE STREAM OF SLAG AND ADJACENT TO ITS ENTRANCE INTO SAID EXPANSION ZONE; CONTROLLING THE QUANTITY OF WATER SO INTRODUCED IN THE RANGE FROM 7. TO 20 PER CENT OF THE WEIGHT OF SLAG INTRODUCED; AGITATING THE RESULTING MIXTURE IN SAID EXPANSION ZONE; AND OVERFLOWING THE RESULTING MOLTEN EXPANDING MIXTURE INTO A COOLING ZONE.
Claim 2
Dependent Claim
145 words
A PROCESS FOR EXPANDING MOLTEN SLAG PRODUCED BY SMELTING PHOSPHATE ROCK, WHICH COMPRISES INTRODUCING A STREAM OF SUCH SLAG AT A TEMPERATURE OF NOT LESS THAN 1350* C. INTO AN EXPANSION ZONE HAVING A LAYER OF INERT GRANULAR MATERIAL PREVIOUSLY SATURATED WITH WATER IN THE BOTTOM THEREOF; CONTROLLING THE RATE OF FLOW OF SAID SLAG IN THE RANGE FROM 90 TO 245 POUNDS PER MINUTE PER CUBIC FOOT OF EFFECTIVE EXPANSION SPACE IN SAID ZONE; INTRODUCING AT LEAST ONE STREAM OF WATER INTO SAID STREAM OF SLAG AT A POINT BENEATH THE STREAM OF SLAG AND ADJACENT TO ITS ENTRANCE INTO SAID EXPANSION ZONE; CONTROLLING THE QUANTITY OF WATER SO INTRODUCED IN THE RANGE FROM 7. TO 20 PER CENT OF THE WEIGHT OF SLAG INTRODUCED; AGITATING THE RESULTING MIXTURE IN SAID EXPANSION ZONE; AND OVERFLOWING THE RESULTING MOLTEN EXPANDING MIXTURE 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 |