Patent US4950627A successfully refreshed from Google Patents.
US4950627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic coating on metal
Assignee: Nouryon Pulp and Performance Chemicals AB
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Filing: 1989-07-19
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Granted: 1990-08-21
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Expires: 2009-07-19
Abstract
Abstract The invention relates to a composition for forming a heat-insulating ceramic coating on a metal, said composition comprising, in % by weight: 10-50% of potassium silicate 10-50% of silica 5-40% of inorganic filler 1-25% of ceramic fibres 2-40% of water 2-20% of hollow microparticles 0-5% of surface active agent. The invention also relates to a method for preparing a composition having the above-mentioned components. Furthermore, the invention relates to the use of the composition comprising the above-mentioned components, for application to internal combustion engine exhaust pipes. Finally, the invention relates to internal combustion engine exhaust pipes coated with layers of the above-mentioned composition.
Inventors
- 👤 Bozena Tokarz
- 👤 Bernt Larsson
- 👤 Sven Jaras
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:46
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/16; C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C23; C23C; C23C24/00; F01N13/14; C04B2111/00; C04B2111/00474; C04B2111/00482; C04B2111/00525; F01N2510/00; F01N2510/02; Y; Y10; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
76 words
A composition for forming a heat-insulating ceramic coating on a metal, comprising: (i) 10 to 50% by weight of potassium silicate; (ii) 10 to 50% by weight of colloidal silica; (iii) 5 to 40% by weight of inorganic filler; (iv) 1 to 25% by weight of ceramic fibres; (v) 2 to 40% by weight of water; (vi) 2 to 20% by weight of hollow microparticles; and (vii) 0 to 5% by weight of surface active agent.
Claim 2
Dependent Claim
76 words
A composition for forming a heat-insulating ceramic coating on a metal, comprising: (i) 10 to 50% by weight of potassium silicate; (ii) 10 to 50% by weight of colloidal silica; (iii) 5 to 40% by weight of inorganic filler; (iv) 1 to 25% by weight of ceramic fibres; (v) 2 to 40% by weight of water; (vi) 2 to 20% by weight of hollow microparticles; and (vii) 0 to 5% by weight of surface active agent.
Claim 3
Dependent Claim
14 words
A composition according to claim 1, wherein the potassium silicate is potassium water glass.
Claim 4
Dependent Claim
19 words
A composition according to claim 1, wherein the ceramic fibres are an Al 2 O 3 -SiO 2 material.
Claim 5
Dependent Claim
20 words
A composition according to claim 1, wherein the inorganic filler is selected from the group consisting of talc and zirconia.
Claim 6
Dependent Claim
62 words
A composition according to claim 1, comprising: (i) 20 to 35% of potassium silicate; (ii) 20 to 35% of colloidal silica; (iii) 10 to 25% of inorganic filler; (iv) 4 to 15% of Al 2 O 3 -Sio 2 fibers; (v) 8 to 25% of water; (vi) 2 to 8% of hollow microparticles; and (vii) 0 to 5% of surface active agent.
Claim 7
Dependent Claim
50 words
A method for preparing a composition according to claim 1 comprising; (a) mixing the potassium silicate with the ceramic fibres; (b) adding the silica under continuous agitation; (c) adding the inorganic filler and water and continuing agitation until a homogeneous mixture is obtained; and adding the hollow microparticles under agitation.
Claim 8
Dependent Claim
23 words
An exhaust pipe of an internal combustion engine including a coating comprising at least one layer of a composition according to claim 1.
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |