US4055434A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory fiber composition and intermediate temperature range fibrous insulation composed thereof
Assignee: Johns Manville Corp
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Filing: 1976-04-23
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Granted: 1977-10-25
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Expires: 1996-04-23
Abstract
Abstract Refractory fiber compositions are disclosed comprising 84% to 97% by weight total silica and alumina, with the silica-to-alumina weight ratio being in the range of 3:2 to 1:1, preferably approximatey 5:4, and 3% to 16% by weight of a dolomitic component comprising calcium oxide and magnesium oxide. The dolomitic component may be composed of burnt dolomite or lime and magnesia. The fibers made of these compositions are suitable for thermal insulation use at temperatures in the range of from 1400 DEG F to 2000 DEG F (760 DEG C to 1100 DEG C) and find particular use as insulating mats and blankets for furnaces, kilns and automobile catalytic mufflers.
Inventors
- 👤 Alwin Bennett Chen
- 👤 John Matthew Pallo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:11
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; C03; C03C; C03C13/00; C04B35/00; C04B35/622; C04B35/62227; C04B35/62231; C04B35/6224; C04B35/62245
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
75 words
A refractory fiber composition suitable for use as thermal insulation in temperature ranges of from 1400° F to 2000° F, which is formed from a melt consisting essentially of 84% to 97% by weight total silica and alumina, with the silica and alumina being present in a silica-to-alumina weight in the range of 3:2 to 1:1, and 3% to 16% by weight of a dolomitic component comprising burnt dolomite or calcium oxide and magnesium oxide.
Claim 2
Dependent Claim
75 words
A refractory fiber composition suitable for use as thermal insulation in temperature ranges of from 1400° F to 2000° F, which is formed from a melt consisting essentially of 84% to 97% by weight total silica and alumina, with the silica and alumina being present in a silica-to-alumina weight in the range of 3:2 to 1:1, and 3% to 16% by weight of a dolomitic component comprising burnt dolomite or calcium oxide and magnesium oxide.
Claim 3
Dependent Claim
14 words
The refractory fiber composition of claim 1 wherein said dolomitic component comprises burnt dolomite.
Claim 4
Dependent Claim
15 words
The refractory fiber composition of claim 1 wherein said dolomitic component comprises lime and magnesia.
Claim 5
Dependent Claim
27 words
The refractory fiber composition of claim 1 wherein said silica and alumina are present in a weight ratio of approximately 5 parts silica to 4 parts alumina.
Claim 6
Dependent Claim
43 words
The refractory fiber composition of claim 1 suitable for thermal insulation use at a temperature of approximately 2000° F which is formed from a melt consisting essentially of approximately 54% by weight silica, 43% by weight alumina and 3% by weight burnt dolomite.
Claim 7
Dependent Claim
43 words
The refractory fiber composition of claim 1 suitable for thermal insulation use at a temperature of approximately 1800° F which is formed from a melt consisting essentially of approximately 52% by weight silica, 42% by weight alumina and 6% by weight burnt dolomite.
Claim 8
Dependent Claim
43 words
The refractory fiber composition of claim 1 suitable for thermal insulation use at a temperature of approximately 1600° F which is formed from a melt consisting essentially of approximately 50% by weight silica, 40% by weight alumina and 10% by weight burnt dolomite.
Claim 9
Dependent Claim
43 words
The refractory fiber composition of claim 1 suitable for thermal insulation use at a temperature of approximately 1400° F which is formed from a melt consisting essentially of approximately 47% by weight silica, 37% by weight alumina and 16% by weight burnt dolomite.
Claim 10
Dependent Claim
17 words
A matted refractory fiber body composed of a plurality of fibers of the composition of claim 1.
Claim 11
Dependent Claim
17 words
A matted refractory fiber body composed of a plurality of fibers of the composition of claim 7.
References Cited (Backward Citations)
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US3019116A
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US3402055A
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US3819387A
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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) | 1980-10-24 | 1981-04-25 | 1981-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-24 | 1985-04-25 | 1985-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-24 | 1989-04-25 | 1989-10-25 | $7700.00 | Window Closed / Lapsed |