Patent US3604598A successfully refreshed from Google Patents.
US3604598A
Expired / Lapsed
US
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Outlet passage construction for teeming vessels
Assignee: United States Steel Corp
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Filing: 1969-07-09
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Granted: 1971-09-14
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Expires: 1989-07-09
Abstract
Abstract A bottom pour-teeming vessel in which the walls of the outlet passage are equipped with an electric-heating coil. The passage walls may be formed of a zirconia or 90 percent alumina liner and a sleeve surrounding the liner but spaced radially therefrom. The heating coil winds about the liner in the space between it and the sleeve and the remainder of the space is filled with alumina powder. A layer of thermal insulation encloses the sleeve. The sleeve is supported on a refractory nut threaded on the lower end of the liner.
Inventors
- 👤 Keith K Kappmeyer
- 👤 James T Shapland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:19
CPC Classifications
B; B22; B22D; B22D41/00; B22D41/50; B22D41/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
70 words
An outlet passage construction for a bottom pour teeming vessel comprising an exclusively refractory liner extending downwardly form the vessel bottom, an electric-resistance heating coil around said liner, said coil being formed of a double helix of graphite, the developed form of which is a loop, semicircular graphite segments integral with the respective helices of said coil, terminals extending radially from said segments, and a refractory sleeve surrounding said coil.
Claim 2
Dependent Claim
70 words
An outlet passage construction for a bottom pour teeming vessel comprising an exclusively refractory liner extending downwardly form the vessel bottom, an electric-resistance heating coil around said liner, said coil being formed of a double helix of graphite, the developed form of which is a loop, semicircular graphite segments integral with the respective helices of said coil, terminals extending radially from said segments, and a refractory sleeve surrounding said coil.
Claim 3
Dependent Claim
22 words
A construction as defined in claim 1 comprising in addition a filling of powdered refractory material within said sleeve embedding said coil.
Claim 4
Dependent Claim
29 words
A nozzle constructed as defined in claim 1 and comprising in addition a block integral with said liner adapted to be embedded in the refractory lining of the vessel.
Claim 5
Dependent Claim
21 words
An extended pouring tube constructed as defined in claim 1, said sleeve being formed of upper and lower threadedly connected sections.
Claim 6
Dependent Claim
18 words
A construction as defined in claim 1 in which said coil is machined from a molded graphite cylinder.
References Cited (Backward Citations)
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |