US4588700A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating to prevent the oxidation of electrodes during electric furnace steel making
Assignee: Minteq International Inc
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Filing: 1984-07-02
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Granted: 1986-05-13
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Expires: 2004-07-02
Abstract
Abstract A coating is provided whih substantially lengthens the life of carbon and graphite electrodes used in electrical arc processes for the manufacture of ferrous metals. The coating forms a silica-phosphorus glass upon the electrodes.
Inventors
- 👤 Frederick V. Reven
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:42
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/5053; C04B41/5057; C03; C03C; C03C8/00; C03C8/02; C03C8/08; C03C8/14; C04B41/80; C04B41/81; C04B41/85; C04B41/87; H; H05; H05B; H05B7/00; H05B7/02; H05B7/06; H05B7/08; H05B7/085
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A composition useful to provide a di-electric coating upon carbon and graphite electrodes used in the production of ferrous metals in electrical arc furnaces which consists essentially of in percentages by weight; 10-70% water; 0.5-15% finely divided silicon dioxide, having a particle size less than 200 mesh; 1-25% phosphoric acid; 2-50% titanium dioxide having a particle size of less than 375 mesh; 2-50% silicon carbide; 0.05-7.5% sodium hexameta phosphate; and 0.1-5.0% organic thickener.
Claim 2
Dependent Claim
73 words
A composition useful to provide a di-electric coating upon carbon and graphite electrodes used in the production of ferrous metals in electrical arc furnaces which consists essentially of in percentages by weight; 10-70% water; 0.5-15% finely divided silicon dioxide, having a particle size less than 200 mesh; 1-25% phosphoric acid; 2-50% titanium dioxide having a particle size of less than 375 mesh; 2-50% silicon carbide; 0.05-7.5% sodium hexameta phosphate; and 0.1-5.0% organic thickener.
Claim 3
Dependent Claim
50 words
The composition of claim 1 which consists essentially of: 15-60% water; 1-10% finely divided silicon dioxide, having a particle size less than 200 mesh; 2-18% phosphoric acid; 3-35% titanium dioxide having a particle size of less than 375 mesh; 3-35% silicon carbide; 0.1-7.0% sodium hexameta phosphate; and 0.5-2.0% organic thickener.
Claim 4
Dependent Claim
50 words
The composition of claim 1 which consists essentially of: 20-50% water; 1.5-7.5% finely divided silicon dioxide, having a particle size less than 200 mesh; 4.5-15% phosphoric acid; 10-30% titanium dioxide having a particle size of less than 375 mesh; 10-30% silicon carbide; 0.25-5.0% sodium hexameta phosphate; and 0.1-1.0% organic thickener.
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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |