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US3213167A
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Process for making lightweight aggregate
Assignee: STIRLING SINTERING CORP
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Filing: 1963-11-06
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Granted: 1965-10-19
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Expires: 1983-11-06
Abstract
No abstract record available.
Inventors
- 👤 Harold T Stirling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:59
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/06; C04B18/08; C04B18/085; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10S; Y10S264/00; Y10S264/49; Y10S425/00; Y10S425/101
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
IN A PROCESS FOR PRODUCING LIGHTWEIGHT AGGREGATE FROM FLY ASH WHEREIN SAID FLY ASH IS PELLETIZED TO FORM PELLETS AND THE PELLETS ARE SINTERED, THE IMPROVEMENT FOR FORMING A NON-STAINING UNIFORMLY LIGHT COLORED PRODUCT COMPRISING PREHEATING SAID PELLETS AT A TEMPERATURE BETWEEN 1200 AND 1800*F. FOR ABOUT FIVE TO FIFTEEN MINUTES.
Claim 2
Dependent Claim
51 words
IN A PROCESS FOR PRODUCING LIGHTWEIGHT AGGREGATE FROM FLY ASH WHEREIN SAID FLY ASH IS PELLETIZED TO FORM PELLETS AND THE PELLETS ARE SINTERED, THE IMPROVEMENT FOR FORMING A NON-STAINING UNIFORMLY LIGHT COLORED PRODUCT COMPRISING PREHEATING SAID PELLETS AT A TEMPERATURE BETWEEN 1200 AND 1800*F. FOR ABOUT FIVE TO FIFTEEN MINUTES.
Claim 3
Dependent Claim
133 words
A PROCESS FOR THE PRODUCTION OF NON-STAINING LIGHTWEIGHT AGGREGATE FROM FLY ASH COMPRISING PELLETIZING SAID FLY ASH TO PRODUCE PELLETS, FORMING A BED OF SAID PELLETS, HEATING SAID BED OF PELLETS TO A TEMPERATURE BETWEEN 3001000*F. FOR A PERIOD OF 4 TO 8 MINUTES, THEN PREHEATING SAID BED OF PELLETS AT A TEMPERATURE BETWEEN 1200 AND 1800*F. FOR BETWEEN 5 AND 15 MINUTES, THEN IGNITING SAID BED OF PELLETS BY SUBJECTING THEM TO A FLAME AT A TEMPERATURE BETWEEN 1900 AND 2800*F. FOR A PERIOD OF 2 TO 6 MINUTES, AND THEN FORCING AIR THROUGH AID BED OF PELLETS FOR FROM 4 TO 8 MINTUES, WHEREBY THE PELLETS ARE SINTERED TO TRANSFORM THE PELLETS INTO STRUCTURALLY STABLE GRANULES HAVING A UNIFORM LIGHT BROWN COLORATION THROUGHOUT AND A STAIN INDEX OF LESS THAN 60.
Claim 4
Dependent Claim
133 words
A PROCESS FOR THE PRODUCTION OF NON-STAINING LIGHTWEIGHT AGGREGATE FROM FLY ASH COMPRISING PELLETIZING SAID FLY ASH TO PRODUCE PELLETS, FORMING A BED OF SAID PELLETS, HEATING SAID BED OF PELLETS TO A TEMPERATURE BETWEEN 3001000*F. FOR A PERIOD OF 4 TO 8 MINUTES, THEN PREHEATING SAID BED OF PELLETS AT A TEMPERATURE BETWEEN 1200 AND 1800*F. FOR BETWEEN 5 AND 15 MINUTES, THEN IGNITING SAID BED OF PELLETS BY SUBJECTING THEM TO A FLAME AT A TEMPERATURE BETWEEN 1900 AND 2800*F. FOR A PERIOD OF 2 TO 6 MINUTES, AND THEN FORCING AIR THROUGH AID BED OF PELLETS FOR FROM 4 TO 8 MINTUES, WHEREBY THE PELLETS ARE SINTERED TO TRANSFORM THE PELLETS INTO STRUCTURALLY STABLE GRANULES HAVING A UNIFORM LIGHT BROWN COLORATION THROUGHOUT AND A STAIN INDEX OF LESS THAN 60.
References Cited (Backward Citations)
US2544752A
Cited
US2693017A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |