Patent US4418097A successfully refreshed from Google Patents.
US4418097A
Expired / Lapsed
US
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Coating for graphite electrodes
Assignee: Lockheed Martin Corp
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Filing: 1981-12-11
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Granted: 1983-11-29
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Expires: 2001-12-11
Abstract
Abstract A process for reducing high temperature oxidation of graphite electrodes for steel making by coating the electrodes with a siloxane fluid, such as dimethylpolysiloxane. Silicon carbide particles can be suspended in the siloxane fluid to improve coating characteristics.
Inventors
- 👤 Mohan S. Misra
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:47
CPC Classifications
H; H05; H05B; H05B7/00; H05B7/02; H05B7/12; H05B7/06; H05B7/08; H05B7/085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
81 words
A process for reducing high temperature oxidation of a graphite electrode by forming on said electrode an outer coating of SiO 2 powder and a subsurface coating of SiC bonded to the electrode surface, said process consisting of the steps of: (a) suspending SiC particles in a dimethylpolysiloxane fluid; (b) coating said electrode with the SiC-dimethylpolysiloxane fluid; and (c) heating said electrode to thereby facilitate the formation of said outer coating of SiO 2 powder and said subsurface coating of SiC.
Claim 2
Dependent Claim
81 words
A process for reducing high temperature oxidation of a graphite electrode by forming on said electrode an outer coating of SiO 2 powder and a subsurface coating of SiC bonded to the electrode surface, said process consisting of the steps of: (a) suspending SiC particles in a dimethylpolysiloxane fluid; (b) coating said electrode with the SiC-dimethylpolysiloxane fluid; and (c) heating said electrode to thereby facilitate the formation of said outer coating of SiO 2 powder and said subsurface coating of SiC.
Claim 3
Dependent Claim
20 words
The process of claim 1 wherein said suspension consists of 0.5 to 40.0 weight percent SiC with the remainder dimethylpolysiloxane.
Claim 4
Dependent Claim
18 words
The process of claim 2, wherein said SiC particles are from about 240-mesh to about 320-mesh in size.
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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) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |