US3868241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of fused cast refractory with streams of oxygen
Assignee: Premier Refractories and Chemicals Inc
•
Filing: 1973-06-12
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Granted: 1975-02-25
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Expires: 1993-06-12
Abstract
Abstract Fused cast refractories which are formed by melting refractory material in a carbon electrode electric arc furnace followed by casting and annealing are treated with oxygen while in the molten state to place the constituents in the most highly oxidized state. This procedure minimizes the exudation of the glassy matrix of the refractory during service. The raw materials for the refractories may be oxidized before melting by heat treating to reduce the oxygen necessary for oxidizing the molten refractory.
Inventors
- 👤 Frank Thomas Felice
- 👤 Robert Earl Fisher
- 👤 Louis John Jacobs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:52
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A METHOD OF PRODUCING A MOLTEN REFRACTORY MATERIAL FOR USE IN FORMING FUSED CAST REFRACTORIES COMPRISING THE STEPS OF: A. PROVIDING REFRACTORY RAW MATERIALS CONSISTING ESSENTIALLY OF ALUMINA, ZIRCONIA AND SILICA FOR PRODUCING FUSED CASST REFRACTORIES, B. MELTING SAID REFRACTORY RAW MATERIALS IN AN ELECTRIC ARC FURNACE HAVING CARBON ELECTRODES WHEREBY SOME OF SAID CARBON IS TRANSFERRED TO SAID MOLTEN REFRACTORY, C. FLOWING SAID MOLTEN REFRACTORY FROM SAID ELECTRIC ARC FURNACE, AND D. DIRECTING A STREM OF OXYGEN ONTO SAID MOLTEN REFRACTORY MATERIAL AS IT IS BEING POURED.
Claim 2
Independent Claim
88 words
A METHOD OF PRODUCING A MOLTEN REFRACTORY MATERIAL FOR USE IN FORMING FUSED CAST REFRACTORIES COMPRISING THE STEPS OF: A. PROVIDING REFRACTORY RAW MATERIALS CONSISTING ESSENTIALLY OF ALUMINA, ZIRCONIA AND SILICA FOR PRODUCING FUSED CASST REFRACTORIES, B. MELTING SAID REFRACTORY RAW MATERIALS IN AN ELECTRIC ARC FURNACE HAVING CARBON ELECTRODES WHEREBY SOME OF SAID CARBON IS TRANSFERRED TO SAID MOLTEN REFRACTORY, C. FLOWING SAID MOLTEN REFRACTORY FROM SAID ELECTRIC ARC FURNACE, AND D. DIRECTING A STREM OF OXYGEN ONTO SAID MOLTEN REFRACTORY MATERIAL AS IT IS BEING POURED.
Claim 3
Dependent Claim
89 words
A method as recited in claim 7 wherein said molten refractory material is poured in a free falling stream and wherein said step of directing a stream of oxygen onto said molten refractory material comprises the steps of: a. impinging a first stream of oxygen directly on said free falling stream to break up said stream and produce intimate contact between said oxygen and said molten refractory material and b. directing a second stream of oxygen tangentially around said free falling stream to consolidate said broken-up free falling stream.
References 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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |