US3758318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of mullite refractory
Assignee: NATIONAL REFRACTORIES & MINERALS Corp A CORP OF
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Filing: 1971-03-29
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Granted: 1973-09-11
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Expires: 1991-03-29
Abstract
Abstract METHOD OF MAKING HIGHLY PURITY SYNTHETIC MULLITE WHEREIN FINELY DIVIDED ALUMINOUS (E.G., ALUMINUM TRIHYDRATE) AND ALUMINOSILICATE (E.G., KAOLIN CLAY) RAW MATERIALS ARE LIGHTLY CALCINED, AT A TEMPERATURE BETWEEN 750 AND 1150* C., AND MILLED PRIOR TO FIRING TO FORM MULLITE REFRACTORY. PREFERABLY THE MILLED CALCINED MATERIALS ARE COMPACTED PRIOR TO FIRING.
Inventors
- 👤 R Farris
- 👤 J Hicks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:30
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/185
Claims Analysis
Total Claims: 0
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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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |