Patent US2315065A successfully refreshed from Google Patents.
Patent US2570077A successfully refreshed from Google Patents.
US2977239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight aggregate and method of making same
Assignee: Chicago Fire Brick Co
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Filing: 1958-08-13
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Granted: 1961-03-28
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Expires: 1978-08-13
Abstract
No abstract record available.
Inventors
- 👤 Joseph R Parsons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:27
CPC Classifications
C; C04; C04B; C04B5/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS OF PRODUCING A LIGHT WEIGHT AGGREGATE WHICH COMPRISES FORMING A MIXTURE CONSISTING ESSENTIALLY OF PARTICLES OF WATER GRANULATED SLAG AND PARTICLES OF REFRACTORY MATERIAL HAVING A SOFTENING POINT OF ABOVE 2300* F., THE PARTICLES OF THE REFRACTORY MATERIAL HAVING A MESH SIZE BELOW APPROXIMATELY 20 MESH AND BEING PRESENT IN AMOUNT FROM APPROXIMATELY 20 PERCENT TO 60 PERCENT BY WEIGHT OF THE COMPOSITION, AND HEATING THE MIXTURE IN MOTION AT A TEMPERATURE AT WHICH THE SLAG BECOMES PLASTIC AND THE ENTRAPPED GASES FROM THE WATER GRANULATED SLAG BLOAT THE PARTICLES INTO GLOBULES
Claim 2
Dependent Claim
94 words
A PROCESS OF PRODUCING A LIGHT WEIGHT AGGREGATE WHICH COMPRISES FORMING A MIXTURE CONSISTING ESSENTIALLY OF PARTICLES OF WATER GRANULATED SLAG AND PARTICLES OF REFRACTORY MATERIAL HAVING A SOFTENING POINT OF ABOVE 2300* F., THE PARTICLES OF THE REFRACTORY MATERIAL HAVING A MESH SIZE BELOW APPROXIMATELY 20 MESH AND BEING PRESENT IN AMOUNT FROM APPROXIMATELY 20 PERCENT TO 60 PERCENT BY WEIGHT OF THE COMPOSITION, AND HEATING THE MIXTURE IN MOTION AT A TEMPERATURE AT WHICH THE SLAG BECOMES PLASTIC AND THE ENTRAPPED GASES FROM THE WATER GRANULATED SLAG BLOAT THE PARTICLES INTO GLOBULES
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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) | 1964-03-27 | 1964-09-26 | 1965-03-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-27 | 1968-09-26 | 1969-03-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-27 | 1972-09-26 | 1973-03-28 | $7700.00 | Window Closed / Lapsed |