US4436762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low pressure plasma discharge formation of refractory coatings
Assignee: Osram Sylvania Inc
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Filing: 1982-07-26
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Granted: 1984-03-13
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Expires: 2002-07-26
Abstract
Abstract A protective refractory metal oxide coating of 3Al 2 O 3 .2SiO 2 or 3B 2 O 3 .2SiO 2 is coated on the internal surface of a vessel by low pressure plasma induced chemical reactions. The source of the SiO 2 required for the reaction can either be from the internal surface of the vessel (e.g., glass, quartz) or it can be introduced into the vessel.
Inventors
- 👤 Walter P. Lapatovich
- 👤 Joseph M. Proud
- 👤 Leslie A. Riseberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:17
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/30; C23C16/40; C23C16/401
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A coating process for coating a surface inside a vessel comprising providing a vessel having contents comprising an inert gas, and reactants, said reactants consisting essentially of SiO 2 and a halide of a metal selected from the group consisting of B, Al, Ga, In, Tl, and combinations thereof; and generating a plasma within said vessel containing said inert gas, and said reactants, to form a refractory metal oxide protective coating on a surface inside the vessel.
Claim 2
Dependent Claim
77 words
A coating process for coating a surface inside a vessel comprising providing a vessel having contents comprising an inert gas, and reactants, said reactants consisting essentially of SiO 2 and a halide of a metal selected from the group consisting of B, Al, Ga, In, Tl, and combinations thereof; and generating a plasma within said vessel containing said inert gas, and said reactants, to form a refractory metal oxide protective coating on a surface inside the vessel.
Claim 3
Dependent Claim
26 words
A coating process according to claim 1 wherein said inert gas is selected from the group consisting of neon, argon, helium, krypton, xenon, and combinations thereof.
Claim 4
Dependent Claim
12 words
A coating process according to claim 1 wherein said halide is chlorine.
Claim 5
Dependent Claim
12 words
A coating process according to claim 1 wherein said metal is boron.
Claim 6
Dependent Claim
12 words
A coating process according to claim 1 wherein said metal is aluminum.
Claim 7
Dependent Claim
20 words
A coating process according to claim 1 wherein said refractory metal oxide is 3Al 2 O 3 .2SiO 2 .
Claim 8
Dependent Claim
14 words
A coating process according to claim 1 wherein said surface contains SiO 2 .
Claim 9
Dependent Claim
16 words
A coating process according to claim 1 wherein said SiO 2 is introduced into said vessel.
Claim 10
Dependent Claim
17 words
A coating process according to claim 1 wherein said surface is an internal surface of said vessel.
Claim 11
Dependent Claim
65 words
A coating process for coating a surface inside a vessel comprising providing a vessel having contents comprising an inert gas, and reactants, said reactants consisting essentially of SiO 2 and a halide of boron; and generating a plasma within said vessel containing said inert gas, and said reactants to form a 3B 2 O 3 .2SiO 2 protective coating on a surface inside the vessel.
Claim 12
Dependent Claim
65 words
A coating process for coating a surface inside a vessel comprising providing a vessel having contents comprising an inert gas, and reactants, said reactants consisting essentially of SiO 2 and a halide of boron; and generating a plasma within said vessel containing said inert gas, and said reactants to form a 3B 2 O 3 .2SiO 2 protective coating on a surface inside the vessel.
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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) | 1987-03-13 | 1987-09-12 | 1988-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-13 | 1991-09-12 | 1992-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-13 | 1995-09-12 | 1996-03-13 | $7700.00 | Window Closed / Lapsed |