Patent US5395312A successfully refreshed from Google Patents.
US3939028A
Expired / Lapsed
US
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Protection of carbon articles
Assignee: Foseco International Ltd
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Filing: 1974-10-29
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Granted: 1976-02-17
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Expires: 1994-10-29
Abstract
Abstract Carbon articles, particularly carbon electrodes, are protected against corrosive attack in use by fusing material to the article, or applying material to the carbon article which under the conditions of its use is capable of fusing to the carbon article, to form a coherent coating of protective material over only that part of the carbon article liable to corrosive attack when the article is in use.
Inventors
- 👤 Josef Schiffarth
- 👤 Clive Graham Lorkin
- 👤 Kenneth John Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:46
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B41/85; C04B41/86; C04B41/45; C04B41/50; C04B41/5022; C25; C25C; C25C3/00; C25C3/06; C25C3/08; C25C3/12; C25C3/125; F; F27; F27B; F27B3/00; F27B3/10; F27B3/12; H; H05; H05B; H05B7/00; H05B7/02; H05B7/12; Y; Y02; Y02P; Y02P10/00; Y02P10/25
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A method of protecting the sides of an arc furnace electrode against corrosive attack which comprises applying to the sides of the electrode preformed sheets of material which, on heating, will fuse to form a coherent coating of protective material on the surface of the electrode and thereafter heating the sides of the electrode to a temperature sufficient to fuse the preformed sheet material thereon.
Claim 2
Independent Claim
65 words
A method of protecting the sides of an arc furnace electrode against corrosive attack which comprises applying to the sides of the electrode preformed sheets of material which, on heating, will fuse to form a coherent coating of protective material on the surface of the electrode and thereafter heating the sides of the electrode to a temperature sufficient to fuse the preformed sheet material thereon.
Claim 3
Dependent Claim
23 words
A method according to claim 1 wherein the heating step is effected by placing the electrode in service in an electric arc furnace.
Claim 4
Dependent Claim
35 words
A method according to claim 1 wherein the preformed sheet material comprises a bonded composition consisting essentially of glaze-forming components constituting a matrix having a melting point of less than 1,000°C and a refractory filler.
Claim 5
Independent Claim
84 words
A method of protecting the sides of an arc furnace carbon electrode against corrosive attack when subjected to elevated temperatures during use comprising applying to the sides of the electrode at least one preformed self-supporting sheet of a material which comprises an inorganic fusible matrix of graphite-wetting material and particles of a refractory filler and thereafter heating the sides of the electrode to a temperature sufficient to fuse the matrix into a continuous refractory-containing coating which firmly adheres to the sides of the electrode.
Claim 6
Independent Claim
84 words
A method of protecting the sides of an arc furnace carbon electrode against corrosive attack when subjected to elevated temperatures during use comprising applying to the sides of the electrode at least one preformed self-supporting sheet of a material which comprises an inorganic fusible matrix of graphite-wetting material and particles of a refractory filler and thereafter heating the sides of the electrode to a temperature sufficient to fuse the matrix into a continuous refractory-containing coating which firmly adheres to the sides of the electrode.
Claim 7
Dependent Claim
23 words
A method as in claim 4 wherein said refractory filler is selected from the group consisting of refractory oxides, carbides, nitrides and borides.
Claim 8
Dependent Claim
35 words
A method as in claim 4 wherein the matrix material is selected from the group consisting of boric oxide, boric acid, metaboric acid, salts of boric acid and metaboric acid, vanadium pentoxide and mixtures thereof.
Claim 9
Dependent Claim
12 words
A method as in claim 4 wherein the matrix is also glaze-forming.
Claim 10
Dependent Claim
22 words
A method as in claim 7 wherein the matrix is selected from the group consisting of phosphates, fluorides, silicates and mixtures thereof.
Claim 11
Dependent Claim
58 words
A method as in claim 4 wherein the matrix is mixture of graphite-wetting materials selected from the group consisting of boric acid, boric oxide, metaboric acid, salts of boric acid and metaboric acid, vanadium pentoxide and mixtures thereof, and graphite-wetting materials which are also glaze-forming materials selected from the group consisting of phosphates, fluorides, silicates and mixtures thereof.
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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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |