Patent US2801183A successfully refreshed from Google Patents.
US2801183A
Expired / Lapsed
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Refractories and methods of making them
Assignee: Compagnie de Saint Gobain SA
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Filing: 1951-04-24
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Granted: 1957-07-30
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Expires: 1971-04-24
Abstract
No abstract record available.
Inventors
- 👤 Kantzer Michel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE METHOD OF PREPARING A REFRACTORY THAT COMPRISES HEATING A KAOLINACEOUS CLAY TO A TEMPERATURE IN THE RANGE 600-750* C. UNTIL ALL CRYSTALLINE STRUCTURE HAS DISAPPEARED, COOLING THE MASS, FINELY DIVIDING IT, MIXING THEREWITH UNFIRED, FINELY DIVIDED NATURAL SILLIMANITE IN AN AMOUNT CIRCA 5% BY WEIGHT, MOLDING THE MIXTURE UNDER PRESSURE AND FIRING THE MOLDED PIECE AT A TEMPERATURE CIRCA 1500* C. UNTIL THE CRYSTALLIZATION OF MULLITE IS SUBSTANTIALLY COMPLETED.
Claim 2
Independent Claim
70 words
THE METHOD OF PREPARING A REFRACTORY THAT COMPRISES HEATING A KAOLINACEOUS CLAY TO A TEMPERATURE IN THE RANGE 600-750* C. UNTIL ALL CRYSTALLINE STRUCTURE HAS DISAPPEARED, COOLING THE MASS, FINELY DIVIDING IT, MIXING THEREWITH UNFIRED, FINELY DIVIDED NATURAL SILLIMANITE IN AN AMOUNT CIRCA 5% BY WEIGHT, MOLDING THE MIXTURE UNDER PRESSURE AND FIRING THE MOLDED PIECE AT A TEMPERATURE CIRCA 1500* C. UNTIL THE CRYSTALLIZATION OF MULLITE IS SUBSTANTIALLY COMPLETED.
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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) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |