Patent US3634588A successfully refreshed from Google Patents.
US3634588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric glass furnace
Assignee: Elemelt Ltd
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Filing: 1970-05-28
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Granted: 1972-01-11
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Expires: 1990-05-28
Abstract
Abstract An electric glass furnace in which one or more axially movable electrodes connected to the same terminal project up through the bottom of the furnace and are mounted in special refractory blocks which form platforms above the bottom of the furnace so that electrodes for each terminal are separated by troughs. Also a separate electrode can be provided in the molten glass drawoff riser, which separate electrode may be selectively connected to an opposite terminal of an electrode adjacent the riser in the furnace, grounded, or disconnected. Furthermore, each electrode is sealed in its refractory block by an inert gas, and it and its block are cooled both by a jacket for coolant liquid around the electrode at least partly recessed in the block, and by a blast of cool air from below and against said jacket, the electrode, and the bottom of the block.
Inventors
- 👤 William R Steitz
- 👤 Robert O Bradley
- 👤 Thomas H Waterworth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:49
CPC Classifications
C; C03; C03B; C03B5/00; C03B5/02; C03B5/027; H; H05; H05B; H05B7/00; H05B7/02; H05B7/12
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
An electric glass furnace comprising: A. a melting chamber with sidewalls and a floor, B. a plurality of electrodes separately axially and vertically movable projecting above said floor, C. separate platforms for the electrodes connected to different electrical terminals, said platforms being formed of refractory blocks and forming troughs between those electrodes connected to said different terminals, D. means for sealing said electrodes in said blocks by an inert gas, and E. means for cooling each electrode and said blocks forming said platforms by both water and air.
Claim 2
Dependent Claim
88 words
An electric glass furnace comprising: A. a melting chamber with sidewalls and a floor, B. a plurality of electrodes separately axially and vertically movable projecting above said floor, C. separate platforms for the electrodes connected to different electrical terminals, said platforms being formed of refractory blocks and forming troughs between those electrodes connected to said different terminals, D. means for sealing said electrodes in said blocks by an inert gas, and E. means for cooling each electrode and said blocks forming said platforms by both water and air.
Claim 3
Dependent Claim
17 words
An electric glass furnace according to claim 1 wherein each said platform comprises a plurality of electrodes.
Claim 4
Dependent Claim
28 words
A furnace according to claim 1 wherein each of said platforms comprises a plurality of refractory blocks forming steps from said floor to the top of said platforms.
Claim 5
Dependent Claim
15 words
A furnace according to claim 1 wherein said blocks have beveled edges toward said floor.
Claim 6
Dependent Claim
23 words
A furnace according to claim 1 wherein said means for cooling each electrode comprises a water-cooled jacket surrounding said electrode below said floor.
Claim 7
Dependent Claim
25 words
A furnace according to claim 5 wherein said means for sealing said electrode in said block also seals said water cooling means surrounding said electrode.
Claim 8
Dependent Claim
39 words
A furnace according to claim 1 wherein said means for air cooling said electrode and blocks comprises a plurality of air jets directed against said electrodes and blocks on the outside of said furnace and said water cooling means.
Claim 9
Dependent Claim
28 words
A furnace according to claim 1 including a riser duct from said floor up outside a wall of said chamber for drawing off molten glass from said chamber.
Claim 10
Dependent Claim
39 words
A furnace according to claim 8 including an electrode in said riser duct connected to a multiple terminal switch having separate connections to ground, to the power source of an electrode in said furnace, and to a disconnect position.
Claim 11
Dependent Claim
83 words
An electric glass furnace comprising: A. a melting chamber with sidewalls and a floor, B. a plurality of electrodes in said furnace projecting above said floor, C. a riser duct from said floor extending up outside a wall of said chamber for drawing off molten glass from said chamber, and D. an electrode in said riser duct connected to a multiple terminal switch having separate connections to ground, to the power source of an electrode in said furnace and to a disconnect position.
Claim 12
Dependent Claim
83 words
An electric glass furnace comprising: A. a melting chamber with sidewalls and a floor, B. a plurality of electrodes in said furnace projecting above said floor, C. a riser duct from said floor extending up outside a wall of said chamber for drawing off molten glass from said chamber, and D. an electrode in said riser duct connected to a multiple terminal switch having separate connections to ground, to the power source of an electrode in said furnace and to a disconnect position.
Claim 13
Dependent Claim
13 words
A furnace according to claim 10 wherein said electrodes are separately axially movable.
Claim 14
Dependent Claim
160 words
An electric glass furnace comprising: A. a melting chamber with sidewalls and a floor, B. a plurality of electrodes in said furnace separately axially and vertically movable projecting above said floor, C. separate platforms for the electrodes connected to different electrical terminals, said platforms being formed of refractory blocks and forming troughs between those electrodes connected to said different terminals, D. a riser duct from said floor extending up outside a wall of said chamber for drawing off molten glass from said chamber, E. an electrode in said riser duct connected to a multiple terminal switch having separate connections to ground, to the power source of an electrode in said furnace, and to a disconnect position, F. means for protecting said electrodes in said furnace in said blocks and said electrode in said riser duct by means of an inert gas, and G. means for cooling each electrode by both water and air including cooling said blocks forming said platforms.
Claim 15
Dependent Claim
160 words
An electric glass furnace comprising: A. a melting chamber with sidewalls and a floor, B. a plurality of electrodes in said furnace separately axially and vertically movable projecting above said floor, C. separate platforms for the electrodes connected to different electrical terminals, said platforms being formed of refractory blocks and forming troughs between those electrodes connected to said different terminals, D. a riser duct from said floor extending up outside a wall of said chamber for drawing off molten glass from said chamber, E. an electrode in said riser duct connected to a multiple terminal switch having separate connections to ground, to the power source of an electrode in said furnace, and to a disconnect position, F. means for protecting said electrodes in said furnace in said blocks and said electrode in said riser duct by means of an inert gas, and G. means for cooling each electrode by both water and air including cooling said blocks forming said platforms.
References Cited (Backward Citations)
GB664121A
Cited
US3440321A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |