US4301387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protection of carbon articles
Assignee: Foseco International Ltd
•
Filing: 1976-05-14
•
Granted: 1981-11-17
•
Expires: 1996-05-14
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 G. Lorkin
- 👤 Kenneth J. Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:34
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5022; C04B41/80; C04B41/81; C04B41/85; C04B41/86; 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; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material of boric oxide which is a graphite-wetting material and silicon carbide as a refractory filler, the boric oxide and silicon carbide being bonded to coherent sheet form.
Claim 2
Dependent Claim
48 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material of boric oxide which is a graphite-wetting material and silicon carbide as a refractory filler, the boric oxide and silicon carbide being bonded to coherent sheet form.
Claim 3
Dependent Claim
31 words
An electrode protection sheet according to claim 1 wherein the refractory filler consists to an extent of at least 80% of its weight of particles of size less than 0.2 mm.
Claim 4
Dependent Claim
21 words
An electrode protection sheet according to claim 1 wherein the refractory filler constitutes 10 to 85% by weight of the sheet.
Claim 5
Dependent Claim
17 words
An electrode protection sheet according to claim 1 and including up to 20% by weight fibrous material.
Claim 6
Dependent Claim
48 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material of boric acid which is a graphite-wetting material and silicon carbide as a refractory filler, the boric acid and silicon carbide being bonded to coherent sheet form.
Claim 7
Dependent Claim
48 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material of boric acid which is a graphite-wetting material and silicon carbide as a refractory filler, the boric acid and silicon carbide being bonded to coherent sheet form.
Claim 8
Dependent Claim
31 words
An electrode protection sheet according to claim 5 wherein the refractory filler consists to an extent of at least 80% of its weight of particles of size less than 0.2 mm.
Claim 9
Dependent Claim
21 words
An electrode protection sheet according to claim 5 wherein the refractory filler constitutes 10 to 85% by weight of the sheet.
Claim 10
Dependent Claim
17 words
An electrode protection sheet according to claim 5 and including up to 20% by weight fibrous material.
Claim 11
Dependent Claim
58 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material which is a graphite-wetting material and a refractory filler, the matrix material being 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 12
Dependent Claim
58 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material which is a graphite-wetting material and a refractory filler, the matrix material being 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 13
Dependent Claim
50 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material which is a graphite-wetting material and a refractory filler, the matrix material being also a glaze-forming material selected from the group consisting of phosphates, fluorides, silicates and mixtures thereof.
Claim 14
Dependent Claim
50 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material which is a graphite-wetting material and a refractory filler, the matrix material being also a glaze-forming material selected from the group consisting of phosphates, fluorides, silicates and mixtures thereof.
Claim 15
Dependent Claim
79 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material which is a graphite-wetting material and a refractory filler, the matrix material being a mixture of graphite-wetting materials selected from the group consisting of boric oxide, boric acid, 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 phosphates, fluorides, silicates and mixtures thereof.
Claim 16
Dependent Claim
79 words
An article consisting of a self-supporting pre-formed electrode protection sheet, the composition of the sheet consisting essentially of a matrix material which is a graphite-wetting material and a refractory filler, the matrix material being a mixture of graphite-wetting materials selected from the group consisting of boric oxide, boric acid, 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 phosphates, fluorides, silicates and mixtures thereof.
Claim 17
Dependent Claim
99 words
An electrode protection sheet having a thickness in the range 1 to 10 mm said sheet consisting essentially of a bonded sheet formed of a composition consisting essentially of a matrix material and a refractory filler, wherein the matrix material is a mixture of graphite-wetting materials selected from the group consisting of boric acid, 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 phosphates, fluorides, silicates and mixtures thereof, and the material of the sheet being heat-fused to the surface of a graphite electrode.
Claim 18
Dependent Claim
99 words
An electrode protection sheet having a thickness in the range 1 to 10 mm said sheet consisting essentially of a bonded sheet formed of a composition consisting essentially of a matrix material and a refractory filler, wherein the matrix material is a mixture of graphite-wetting materials selected from the group consisting of boric acid, 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 phosphates, fluorides, silicates and mixtures thereof, and the material of the sheet being heat-fused to the surface of a graphite electrode.
Claim 19
Dependent Claim
34 words
An electrode protection sheet formed of a bonded composition consisting essentially of an inorganic graphite-wetting matrix material and a particulate refractory filler, said sheet being heat-fused to an exterior surface of a graphite electrode.
Claim 20
Dependent Claim
34 words
An electrode protection sheet formed of a bonded composition consisting essentially of an inorganic graphite-wetting matrix material and a particulate refractory filler, said sheet being heat-fused to an exterior surface of a graphite electrode.
References Cited (Backward Citations)
US1948382A
Cited
US2079110A
Cited
US2229329A
Cited
US2472171A
Cited
US3078186A
Cited
US3178807A
Cited
US3401025A
Cited
US3541659A
Cited
US3814699A
Cited
US3793134A
Cited
US4229397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-16 | 1985-05-18 | 1985-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-16 | 1989-05-18 | 1989-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-16 | 1993-05-18 | 1993-11-17 | $7700.00 | Window Closed / Lapsed |