US2729570A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lightweight aggregates and method of making same from clay residues
Assignee: Mcdowell Co Inc
•
Filing: 1952-04-25
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Granted: 1956-01-03
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Expires: 1972-04-25
Abstract
No abstract record available.
Inventors
- 👤 Charles W Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:43
CPC Classifications
C; C04; C04B; C04B20/00; C04B20/02; C04B20/04; C04B20/06; C04B20/068; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
METHOD FOR FORMING A LIGHTWEIGHT AGGREGATE FOR USE IN CONCRETE PRODUCTS, FROM CLAY RICH IN SILICON DIOXIDE, ALUMINUM OXIDE AND CONTAINING SUBSTANTIAL AMOUNTS OF OXIDIZED IRON AND WHICH HAS BEEN DIGESTED WITH SULFURIC ACID AND LEACHED TO REMOVE ALUMINUM SULFATE AND A SUBSTANTIAL PORTION OF THE IRON CONTENT AS SALTS THEREOF, SUCH METHOD COMPRISING: MIXING THE THUS-TREATED CLAY IN DISINTEGRATED FORM WITH FINE FUEL AND FORMING THE MIXTURE INTO PELLETS; IGNITING THE FUEL IN A LAYER OF THE PETTLETS AND PASSING AIR THERETHROUGH, SUFFICIENT FUEL BEING USED FOR THE MIXTURE TO CAUSE ONLY MOMENTARY SINTERING OF THE PELLETS TO FORM A RIGID CELLULAR SINTER CAKE; AND THEN COOLING AND CRUSHING SUCH CAKE TO PROVIDE THE LIGHTWEIGHT AGGREGATE OF DESIRED SIZE.
Claim 2
Dependent Claim
120 words
METHOD FOR FORMING A LIGHTWEIGHT AGGREGATE FOR USE IN CONCRETE PRODUCTS, FROM CLAY RICH IN SILICON DIOXIDE, ALUMINUM OXIDE AND CONTAINING SUBSTANTIAL AMOUNTS OF OXIDIZED IRON AND WHICH HAS BEEN DIGESTED WITH SULFURIC ACID AND LEACHED TO REMOVE ALUMINUM SULFATE AND A SUBSTANTIAL PORTION OF THE IRON CONTENT AS SALTS THEREOF, SUCH METHOD COMPRISING: MIXING THE THUS-TREATED CLAY IN DISINTEGRATED FORM WITH FINE FUEL AND FORMING THE MIXTURE INTO PELLETS; IGNITING THE FUEL IN A LAYER OF THE PETTLETS AND PASSING AIR THERETHROUGH, SUFFICIENT FUEL BEING USED FOR THE MIXTURE TO CAUSE ONLY MOMENTARY SINTERING OF THE PELLETS TO FORM A RIGID CELLULAR SINTER CAKE; AND THEN COOLING AND CRUSHING SUCH CAKE TO PROVIDE THE LIGHTWEIGHT AGGREGATE OF DESIRED SIZE.
References Cited (Backward Citations)
US1255878A
Cited
US1538837A
Cited
US1747551A
Cited
US1945172A
Cited
US1895159A
Cited
US2077347A
Cited
US2555289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |