Refractory pouring tube
Abstract
Abstract THERE IS PROVIDED A FIRED REFRACTORY ARTICLE COMPOSED OF A FUSED REFRACTORY AGGREGATE AND A REFRACTORY BINDER MATERIAL FOR BONDING THE AGGREGATE TOGETHER. THE AGGREGATE CONSISTS ESSENTIALLY OF (BY WEIGHT) ABOUT 42-48 PERCENT ALUMINA (AL2O3) AND ABOUT 17-23 PERCENT SILICA (SIO2) GENERALLY IN THE FORM OF MULLITE CRYSTALS (3AL2O3-2SIO2), AND ABOUT 33-39 PERCENT UNSTABILIZED ZIRCONIA (ZRO2) DISPERSED THROUGHOUT THE MULLITE STRUCTURE. THE AGGREGATE FORMS 50 TO 80% WHILE THE BINDER FORMS 50 TO 20% OF THE REFRACTORY ARTICLE. THE BINDER ORIGINALLY CONTAINS 10 TO 90% OF 100 MESH ZIRCON SAND, 10 TO 90% 325 MESH ALUMINA AND 0 TO 50% RAW CLAY. IN ADDITION SUITABLE PLASTICIZERS AND ORGANIC MATERIALS ARE ADDED FOR FORMING PURPOSE AND ARE ELIMINATED DURING HEAT TREATMENT OF THE ARTICLE.
Inventors
- 👤 T Smith
Bibliographic Details
Claims Analysis
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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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |