Patent US3723593A successfully refreshed from Google Patents.
US3723593A
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Process for continuously annealing a fused cast refractory body
Assignee: AGC Inc
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Filing: 1972-03-31
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Granted: 1973-03-27
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Expires: 1992-03-31
Abstract
Abstract A process for continously annealing a fused cast refractory body, in order to obtain a crack-free product, in which the fused cast refractory body is placed on a suitable preheated carrier which has been previously heated to a temperature of greater than 500* C in a preheat chamber, and is charged into an annealing tunnel which is divided into a hot zone and a cooling zone having at least one cooling section.
Inventors
- 👤 I Ono
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/653; C04B35/657
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
30 words
The process of claim 1 wherein said mold is placed on a carrier which has been preheated at a temperature of greater than 500* C prior to receiving said mold.
Claim 2
Dependent Claim
32 words
The process of claim 2 wherein said cooling is conducted in a zone having an ambient temperature of from 50* to 200* C less than the surface temperature of the crystallized product.
Claim 3
Dependent Claim
35 words
The process of claim 1 wherein said cast refractory material is an Al2O3-SiO2 type fused cast refractory product which is solidified under an initial temperature of greater than 1,200* C for more than 1 hour.
Claim 4
Dependent Claim
35 words
The process of claim 1 wherein said cast refractory material is a ZrO2-Al2O3-SiO2 type fused cast refractory product which is solidified under an initial temperature of greater than 1,100* C for more than 1 hour.
Claim 5
Dependent Claim
35 words
The process of claim 1 wherein said cast refractory material is an Al2O3 type fused cast refractory material which is solidified under an initial temperature of greater than 1,400* C for more than 30 minutes.
Claim 6
Dependent Claim
35 words
The process of claim 1 wherein said cast refractory material is a MgO-Cr2O3-Al2O3-Fe2O3(FeO) type fused cast refractory product which is solidified under an initial temperature of greater than 1,300* C for more than 30 minutes.
Claim 7
Dependent Claim
42 words
The process of claim 3 wherein said gradual cooling procedure occurs in at least two sections wherein the temperature in said first section is between 150* C and 600* C, and the temperature in a second section is less than 250* C.
Claim 8
Dependent Claim
99 words
The process of claim 4 wherein said Al2O3-SiO2 type fused cast refractory product comprises: 72% to 82% by weight Al2O3 15% to 25% by weight SiO2 0.5% to 3% by weight TiO2 0.5% to 2.5% by weight Fe2O3 Which is melted and subjected to a hot zone having a temperature of about 1,000* to 1,400* C and then to a plurality of cooling zones wherein The first section has a temperature of above 600* C, the second section has a temperature of from 200* to 60* C and the third section has a temperature of less than 200* C.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |