US4037015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat insulating coating material
Assignee: Hitachi Ltd
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Filing: 1975-03-21
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Granted: 1977-07-19
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Expires: 1995-03-21
Abstract
Abstract A heat insulating coating material is provided by admixing an alkali metal silicate binder and water with aggregates comprising silica-containing inorganic refractory fibers, silica-containing porous refractory materials and silica-containing powdery refractory materials. The alkali metal silicate binder can be replaced by a phosphate binder, depending upon the nature of an atmosphere, and finely divided metals can be incorporated into the aggregates.
Inventors
- 👤 Keiichi Koike
- 👤 Toshimi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:48
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/34; C04B28/24; C04B28/26; C04B2111/00; C04B2111/00474; C04B2111/00482; C04B2111/00525; C04B2111/20; C04B2111/28; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
101 words
A composition for forming a heat insulating coating comprising (a) 5% to 15% of silcia-alumina fibers, (b) 5% to 15% of a hollow refractory selected from the group consisting of silica balloons, alumina balloons, silica-alumina balloons and volcanic ash sand balloons, (c) 30% to 80% of a powdery refractory comprising a material selected from the group consisting of silica powder, fused silica, zircon powder and silic-alumina clay, (d) a binder comprising 5% to 10% of sodium metasilicate and (e) water in an amount of 1.5 to 2.5 times the amount of components (a), (b), (c) and (d) on a weight basis.
Claim 2
Dependent Claim
101 words
A composition for forming a heat insulating coating comprising (a) 5% to 15% of silcia-alumina fibers, (b) 5% to 15% of a hollow refractory selected from the group consisting of silica balloons, alumina balloons, silica-alumina balloons and volcanic ash sand balloons, (c) 30% to 80% of a powdery refractory comprising a material selected from the group consisting of silica powder, fused silica, zircon powder and silic-alumina clay, (d) a binder comprising 5% to 10% of sodium metasilicate and (e) water in an amount of 1.5 to 2.5 times the amount of components (a), (b), (c) and (d) on a weight basis.
Claim 3
Dependent Claim
31 words
The compositions of claim 1, wherein said composition further contains 1 to 10% of a fine metal powder selected from the group consisting of Cr, Ti, Zr, Cu, Ag and Au.
Claim 4
Dependent Claim
28 words
The composition of claim 1, wherein at least about half of said powdery refractory on a weight basis is silica powder, fused silica, zircon powder or silica-alumina clay.
Claim 5
Dependent Claim
20 words
The composition of claim 3, wherein said powdery refractory contains ZrO 2 , MgO or Al 2 O 3 .
Claim 6
Dependent Claim
64 words
A composition for forming a heat insulating coating comprising (a) silica-alumina fibers, (b) a hollow refractory selected from the group consisting of silica balloons, alumina balloons, silica-alumina balloons and valeanic ash sand balloons, (c) a powdery refractory comprising a material selected from the group consisting of silica powder, fused silica, zircon powder and silica-alumina clay, (d) a binder comprising trisodium phosphate and (e) water.
Claim 7
Dependent Claim
64 words
A composition for forming a heat insulating coating comprising (a) silica-alumina fibers, (b) a hollow refractory selected from the group consisting of silica balloons, alumina balloons, silica-alumina balloons and valeanic ash sand balloons, (c) a powdery refractory comprising a material selected from the group consisting of silica powder, fused silica, zircon powder and silica-alumina clay, (d) a binder comprising trisodium phosphate and (e) water.
Claim 8
Dependent Claim
68 words
The composition of claim 5, wherein said composition comprises 5 to 15% silica-alumina fibers, 5 to 15% porous refractory, 30 to 80% powdery refractory and 5 to 10% binder, the percents being based on the weight of components (a), (b), (c) and (d), the amount of water in said composition being 1.5 to 2.5 times the amount of components (a), (b), (c) and (d) on a weight basis.
Claim 9
Dependent Claim
28 words
The composition of claim 6, wherein at least about half of said powdery refractory on a weight basis is silica powder, fused silica, zircon powder or silica-alumina clay.
Claim 10
Dependent Claim
21 words
The composition of claim 7, wherein said powdery refractory contains TiO 2 , ZrO 2 or Al 2 O 3 .
Claim 11
Dependent Claim
29 words
The composition of claim 6, wherein said composition further contains about 1 to 10% fine metal powder selected from the group consisting Cr, Ti, Zr, Cu, Ag and Au.
Claim 12
Dependent Claim
28 words
A process for forming a heat insulating coating on a metal substrate comprising applying the composition of claim 5 to said substrate and allowing said composition to dry.
Claim 13
Dependent Claim
28 words
A process for forming a heat insulating coating on a metal substrate comprising applying the composition of claim 1 to said substrate and allowing said composition to dry.
Claim 14
Dependent Claim
45 words
In an apparatus having a metal surface and a heat-protective coating on said metal surface formed from an inorganic material, the improvement wherein said heat-protective coating is formed by applying the composition of claim 1 to said metal surface and allowing said composition to dry.
Claim 15
Dependent Claim
45 words
In an apparatus having a metal surface and a heat-protective coating on said metal surface formed from an inorganic material, the improvement wherein said heat-protective coating is formed by applying the composition of claim 5 to said metal surface and allowing said composition to dry.
Claim 16
Dependent Claim
12 words
The composition of claim 2, wherein said fine metal powder is Cr.
Claim 17
Dependent Claim
12 words
The composition of claim 9, wherein said fine metal powder is Cr.
Claim 18
Dependent Claim
97 words
The composition for forming a heat insulating coating comprising (a) 5% to 15% of silica-alumina fibers, (b) 5% to 15% of a porous refractory having a particle size in the range of 0.2-1.0 mm, (c) 30% to 80% of a powdery refractory comprising a material selected from the group consisting of silica powder, fused silica, zircon powder and silica-alumina clay, (d) a binder comprising 5% to 10% of sodium metasilicate or trisodium phosphate and (e) water in an amount of 1.5 to 2.5 times the amount of components (a), (b), (c) and (d) on a weight basis.
Claim 19
Dependent Claim
97 words
The composition for forming a heat insulating coating comprising (a) 5% to 15% of silica-alumina fibers, (b) 5% to 15% of a porous refractory having a particle size in the range of 0.2-1.0 mm, (c) 30% to 80% of a powdery refractory comprising a material selected from the group consisting of silica powder, fused silica, zircon powder and silica-alumina clay, (d) a binder comprising 5% to 10% of sodium metasilicate or trisodium phosphate and (e) water in an amount of 1.5 to 2.5 times the amount of components (a), (b), (c) and (d) on a weight basis.
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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) | 1980-07-18 | 1981-01-17 | 1981-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-18 | 1985-01-17 | 1985-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-18 | 1989-01-17 | 1989-07-19 | $7700.00 | Window Closed / Lapsed |