Patent US4159353A successfully refreshed from Google Patents.
US4159353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Platinum coating dense refractories
Assignee: Corning Glass Works
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Filing: 1978-01-19
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Granted: 1979-06-26
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Expires: 1998-01-19
Abstract
Abstract The forming of an adherent platinum coating on the surface of hard, highly dense refractories by plasma flame spraying thereon an intermediate layer of a refractory oxide selected from the group comprised of zirconia, zircon, alumina, cordierite, mullite, or zirconia-alumina-silica having a particle size between 140 and 200 mesh, and further plasma sraying thereon a substantially 20-100 micron size platinum powder which is densified by heating to temperatures of 1350 DEG -1600 DEG C.
Inventors
- 👤 Lee M. Adelsberg
- 👤 Robert Dejaiffe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:40
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C4/00; C23C4/02; C23C4/04; C23C4/06; C23C4/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
118 words
The method of applying an adherent coat of platinum to hard, dense refractory which process comprises cleaning a surface of the refractory, plasma flame spraying the cleaned surface of the refractory with a refractory oxide powder selected from the group comprised of zirconia, zircon, alumina, cordierite, mullite or zirconia-alumina-silica of a 140-200 mesh particle size to form an intermediate refractory oxide coating layer thereon, firing the coated refractory to achieve chemical bonding and sintering of the intermediate layer to the refractory thereby resulting in that layer being rough with pores and crevices therein, plasma flame spraying the intermediate coated refractory with platinum powder to form a platinum coating thereon, heating the platinum coated refractory to densify the platinum.
Claim 2
Independent Claim
118 words
The method of applying an adherent coat of platinum to hard, dense refractory which process comprises cleaning a surface of the refractory, plasma flame spraying the cleaned surface of the refractory with a refractory oxide powder selected from the group comprised of zirconia, zircon, alumina, cordierite, mullite or zirconia-alumina-silica of a 140-200 mesh particle size to form an intermediate refractory oxide coating layer thereon, firing the coated refractory to achieve chemical bonding and sintering of the intermediate layer to the refractory thereby resulting in that layer being rough with pores and crevices therein, plasma flame spraying the intermediate coated refractory with platinum powder to form a platinum coating thereon, heating the platinum coated refractory to densify the platinum.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the refractory and the intermediate oxide layer is preferably selected from the group comprising zirconia, zircon, alumina, cordierite, mullite or zirconia-alumina-silica.
Claim 4
Dependent Claim
20 words
The method of claim 2 wherein the refractory and the intermediate oxide layer are composed of the same refractory material.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein the refractory and the intermediate refractory oxide layer have the same or similar coefficient of thermal expansion.
Claim 6
Dependent Claim
23 words
The method of claim 1 wherein the thickness of the intermediate refractory oxide layer is within the range of 0.5 to 5 mils.
Claim 7
Dependent Claim
37 words
The method of claim 1 wherein the refractory coated with the intermediate oxide layer is fired to between 1350° C. and 1600° C. to achieve sintering and chemical bonding of the intermediate oxide layer to the refractory.
Claim 8
Dependent Claim
15 words
The method of claim 1 wherein the platinum powder particle size is between 20-100 microns.
Claim 9
Dependent Claim
15 words
The method of claim 1 wherein the preferred platinum particle size is between 20-45 microns.
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein the platinum coated refractory is heated to between 1350° C. and 1600° C. to densify the platinum coating.
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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) | 1982-06-25 | 1982-12-25 | 1983-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-06-25 | 1986-12-25 | 1987-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-06-25 | 1990-12-25 | 1991-06-26 | $7700.00 | Window Closed / Lapsed |