Patent US360646A successfully refreshed from Google Patents.
Patent US4099990A successfully refreshed from Google Patents.
US4099990A
Expired / Lapsed
US
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Method of applying a layer of silica on a substrate
Assignee: BP PLC
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Filing: 1976-03-23
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Granted: 1978-07-11
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Expires: 1996-03-23
Abstract
Abstract Substrate surfaces are rendered resistant to coking by vaporizing an alkoxysilane in contact with the surface to form a protective layer of silica thereon.
Inventors
- 👤 David Emmerson Brown
- 👤 John Trevor Kent Clark
- 👤 John James McCarroll
- 👤 Malcolm Leslie Sims
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:32
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/401; C23C16/402; C23C16/04; C23C16/045
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
58 words
A process for forming protective films on a nickel, chromium or iron alloy substrate surface susceptible to coke formation, comprising first preoxidizing said surface at an elevated temperature and then depositing on said preoxidized substrate surface a layer of silica by thermally decomposing an alkoxy silane vapor in a carrier gas in contact with the preoxidized substrate surface.
Claim 2
Dependent Claim
58 words
A process for forming protective films on a nickel, chromium or iron alloy substrate surface susceptible to coke formation, comprising first preoxidizing said surface at an elevated temperature and then depositing on said preoxidized substrate surface a layer of silica by thermally decomposing an alkoxy silane vapor in a carrier gas in contact with the preoxidized substrate surface.
Claim 3
Dependent Claim
25 words
A process as defined in claim 1 wherein said substrate surface is preoxidized at elevated temperatures in an oxidizing atmosphere of carbon dioxide or steam.
Claim 4
Dependent Claim
27 words
A process according to claim 1 wherein the alkoxy silane is selected from mono-, di-, tri- and tetra alkoxysilane and the partially hydrolysed or polymerised products thereof.
Claim 5
Dependent Claim
12 words
A process according to claim 3 wherein the alkoxy silane is tetraethoxysilane.
Claim 6
Dependent Claim
25 words
A process according to claim 1 wherein the alkoxysilane is vapourised into a carrier gas stream selected from carbon dioxide, steam, nitrogen, helium and argon.
Claim 7
Dependent Claim
22 words
A process according to claim 5 wherein the concentration of the alkoxysilane in the carrier gas is less than 10% by volume.
Claim 8
Dependent Claim
23 words
A process according to claim 5 wherein the concentration of the alkoxysilane in the carrier gas is between 0.05 and 1.5% by volume.
Claim 9
Dependent Claim
24 words
A process according to claim 1 wherein the silica layer is deposited on the substrate surface at a temperature between 200° and 1200° C.
Claim 10
Dependent Claim
24 words
A process according to claim 1 wherein the silica layer is deposited on the substrate surface at a temperature between 600° and 900° C.
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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) | 1981-07-10 | 1982-01-09 | 1982-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-10 | 1986-01-09 | 1986-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-10 | 1990-01-09 | 1990-07-11 | $7700.00 | Window Closed / Lapsed |