US4126474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory for aluminum-melting furnaces
Assignee: AP GREEN REFRACTORIES Inc FORMERLY KNOWN AS GENERAL ACQUISITION Corp
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Filing: 1977-08-19
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Granted: 1978-11-21
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Expires: 1997-08-19
Abstract
Abstract An improved alumina or alumino-silicate refractory for lining aluminum-melting furnaces and other containers for molten aluminum including 0.5 to 30% by weight of BaSO 4 . The addition of BaSO 4 to a phosphate-bonded or phosphate-free plastic, ramming mix, brick, mortar, or castables eliminates metal penetration and reduces dross and metal adherence.
Inventors
- 👤 Raymond W. Talley
- 👤 Ray A. Henrichsen
- 👤 Wate T. Bakker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:04
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/6303; C04B35/01; C04B35/10; C04B35/101; C04B35/16; C04B35/18; C04B35/6306; C04B35/66; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/085; C04B2111/00; C04B2111/00474; C04B2111/0087; C04B2111/00879; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3217; C04B2235/70; C04B2235/96; C04B2235/9669; C04B2235/9676; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
63 words
In an unfired phosphate-bonded alumina or alumino-silicate refractory for lining aluminum-melting furnaces and other containers for molten aluminum, the binder in said refractory consisting essentially of a wet phosphate binder, the improvement comprising the addition of 0.5 to 30% by weight of BaSO 4 , said refractory having improved resistance to metal penetration and to dross and metal adherence and improved storage life.
Claim 2
Dependent Claim
63 words
In an unfired phosphate-bonded alumina or alumino-silicate refractory for lining aluminum-melting furnaces and other containers for molten aluminum, the binder in said refractory consisting essentially of a wet phosphate binder, the improvement comprising the addition of 0.5 to 30% by weight of BaSO 4 , said refractory having improved resistance to metal penetration and to dross and metal adherence and improved storage life.
Claim 3
Dependent Claim
13 words
The refractory of claim 1, wherein said phosphate is provided as phosphoric acid.
Claim 4
Dependent Claim
11 words
The refractory of claim 3, wherein said refractory is a plastic.
Claim 5
Dependent Claim
12 words
The refractory of claim 3, wherein said refractory is a ramming mix.
Claim 6
Dependent Claim
15 words
The refractory of claim 3, wherein said refractory is in the form of a brick.
Claim 7
Dependent Claim
15 words
The refractory of claim 3, wherein said refractory is in the form of a mortar.
Claim 8
Dependent Claim
18 words
The refractory of claim 4, wherein alumina is present in the amount of at least 30% by weight.
Claim 9
Dependent Claim
18 words
The refractory of claim 4, wherein alumina is present in the amount of at least 45% by weight.
Claim 10
Dependent Claim
19 words
The refractory of claim 4, wherein BaSO 4 is present in the range of 3% to 10% by weight.
Claim 11
Dependent Claim
53 words
In an unfired phosphate-bonded refractory for lining aluminum-melting furnaces, said refractory consisting essentially of alumina, water, and phosphoric acid, the improvement comprising the addition of 0.5% to 30% by weight of BaSO 4 , said refractory having improved resistance to molten metal penetration and to dross and metal adherence and improved storage life.
Claim 12
Dependent Claim
53 words
In an unfired phosphate-bonded refractory for lining aluminum-melting furnaces, said refractory consisting essentially of alumina, water, and phosphoric acid, the improvement comprising the addition of 0.5% to 30% by weight of BaSO 4 , said refractory having improved resistance to molten metal penetration and to dross and metal adherence and improved storage life.
Claim 13
Dependent Claim
19 words
The refractory of claim 10, wherein BaSO 4 is present in the range of 3% to 10% by weight.
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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) | 1981-11-20 | 1982-05-22 | 1982-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-20 | 1986-05-22 | 1986-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-20 | 1990-05-22 | 1990-11-21 | $7700.00 | Window Closed / Lapsed |