Hot tops and mixture of materials therefor
Abstract
Abstract THE BASIC IDEA OF THE INVENTION IS TO PROVIDE A WALL MATERIAL FOR THE HOT TOP HAVING SUCH A COMPOSITION THAT THE SURFACE CONTACTING THE MOLTEN STEEL OR OTHER METAL WILL BE COVERED WITH A SMOOTH, GASTIGHT, THIN, VITREOUS MINERALIC LAYER WHEN CONTACTING THE MOLTEN STEEL OR METAL. THE WALL MATERIAL IS MADE FROM A MIXTURE OF GRANULAR OR POWDERED AERATED CONCRETE OR POROUS CONCRETE AND ORGANIC FIBRE MATERIAL SUCH AS WOOD MEAL, SAWDUST, MECHANICAL WOOD PULP AND A BINDER, AND ACCORDING TO THE INVENTION THE MIXTURE ALSO COMPRISES SAND OF SUCH A RATE OF REFRACTABILITY THAT THE MELTING TEMPERATURE OF THE SAND IS LOWER THAN THE TEMPERATURE OF THE MOLTEN METAL, SAID SAND, UNDER THE INFLUENCE OF THE HEAT FROM THE MOLTEN METAL, PROVIDING A THIN VITREOUS MINERALIC LAYER.
Inventors
- 👤 Bertil Hilmer Allvin
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |