US4306030A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon-containing refractory
Assignee: Krosaki Harima Corp
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Filing: 1980-01-30
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Granted: 1981-12-15
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Expires: 2000-01-30
Abstract
Abstract The invention relates to precluding the shortcomings intrinsic to the conventional unburned carbon-containing refractory bricks, i.e., oxidization under high temperature conditions and the incidental decarbonization, the phenomenon of exfoliation and detachment of the fragile layers, and more particularly to obtaining thereby unburned carbon-containing refractory bricks having the high properties by causing refractory brick material comprising substantially more than 1 weight % carbon to contain 1-10 weight % aluminum powder and/or magnesium powder each independently or in a mixture thereof, and/or 0.5-6 weight % silicon powder.
Inventors
- 👤 Akira Watanabe
- 👤 Toshiyuki Matsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/44; C04B35/013; C04B35/10; C04B35/101
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
Unburned carbon-containing refractory bricks consisting essentially of 5-75 weight % of a carbonaceous material, 1-10 weight % of a metal powder selected from the group consisting of aluminum powder, magnesium powder or mixtures thereof, and wherein the residual portion of the brick consists essentially of an inorganic refractory material.
Claim 2
Dependent Claim
49 words
Unburned carbon-containing refractory bricks consisting essentially of 5-75 weight % of a carbonaceous material, 1-10 weight % of a metal powder selected from the group consisting of aluminum powder, magnesium powder or mixtures thereof, and wherein the residual portion of the brick consists essentially of an inorganic refractory material.
Claim 3
Dependent Claim
35 words
Unburned carbon-containing refractory bricks as defined in claim 1, wherein the carbonaceous material is selected from the group consisting of natural graphite, artificial graphite, electrode waste, petroleum coke, foundry coke, carbon black or mixtures thereof.
Claim 4
Dependent Claim
36 words
Unburned carbon-containing refractory bricks as defined in claim 1 wherein the inorganic refractory material is selected from the group consisting of magnesia, chrome, spinel, dolomite, alumina, zircon, silicon carbide, titanium carbide, silicon nitride, and boron nitride.
Claim 5
Dependent Claim
54 words
Unburned carbon-containing refractory bricks consisting essentially of 5-75 weight % of a carbonaceous material, 1-10 weight % of a metal powder selected from the group consisting of aluminum powder, magnesium powder or mixtures thereof, 0.5-6.0 weight % silicon powder, and wherein the residual portion of the brick consists essentially of an inorganic refractory material.
Claim 6
Dependent Claim
54 words
Unburned carbon-containing refractory bricks consisting essentially of 5-75 weight % of a carbonaceous material, 1-10 weight % of a metal powder selected from the group consisting of aluminum powder, magnesium powder or mixtures thereof, 0.5-6.0 weight % silicon powder, and wherein the residual portion of the brick consists essentially of an inorganic refractory material.
Claim 7
Dependent Claim
35 words
Unburned carbon-containing refractory bricks as defined in claim 4 wherein the carbonaceous material is selected from the group consisting of natural graphite, artificial graphite, electrode waste, petroluem coke, foundry coke, carbon black or mixtures thereof.
Claim 8
Dependent Claim
36 words
Unburned carbon-containing refractory bricks as defined in claim 4 wherein the inorganic refractory material is selected from the group consisting of magnesia, chrome, spinel, dolomite, alumina, zircon, silicon carbide, titanium carbide, silicon nitride, and boron nitride.
Claim 9
Dependent Claim
57 words
A wear lining structure of a furnace made of unburned carbon-containing bricks which bricks consist essentially of 5-75% of a carbonaceous material, 1-10% by weight of a metal powder selected from the group consisting of aluminum powders, magnesium powders or mixtures thereof and wherein the residual portion of the brick consists essentially of an inorganic refractory material.
Claim 10
Dependent Claim
57 words
A wear lining structure of a furnace made of unburned carbon-containing bricks which bricks consist essentially of 5-75% of a carbonaceous material, 1-10% by weight of a metal powder selected from the group consisting of aluminum powders, magnesium powders or mixtures thereof and wherein the residual portion of the brick consists essentially of an inorganic refractory material.
Claim 11
Dependent Claim
17 words
A wear lining furnace according to claim 7 which also contains 0.5-6.0 wt. percent of silicon powder.
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) | 1984-12-14 | 1985-06-15 | 1985-12-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-14 | 1989-06-15 | 1989-12-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-14 | 1993-06-15 | 1993-12-15 | $7700.00 | Window Closed / Lapsed |