US3898366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical heating system with refractory wear indicia
Assignee: Jones and Laughlin Steel Inc
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Filing: 1974-05-08
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Granted: 1975-08-05
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Expires: 1994-05-08
Abstract
Abstract Refractory wear detection apparatus in a refractory lined metallurgical heating system, a portion of the material being processed bridges and forms an electrical junction, between conductor members disposed in the refractory, when a preselected extent of refractory wear is reached.
Inventors
- 👤 Terrence D Aurini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:42
CPC Classifications
F; F27; F27D; F27D21/00; F27D21/0021; F27B; F27B3/00; F27B3/10; F27B3/12; F27D11/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
In combination, with a metallurgical heating system including: a vessel, having a refractory lining, for containing material being processed; said refractory lining having a face forming a portion of the interior surface of said vessel; indicia apparatus circuitry for indicating when a preselected extent of wear of said lining is reached without interrupting the operation of said system, which apparatus circuitry is normally electrically open and comprises: a. external indicia means for producing an electrically generated signal; b. a pair of conductor members disposed in said lining and electrically connected to said indicia means; c. at least one of said members extending toward, but short of said face, to a preselected point for which a signal is desired, when the refractory lining covering said one member wears and said one member is exposed to the interior of said vessel; d. said conductor members being spaced apart and positioned in said refractory lining and of a type such that when electrically conductive material bridges said members an electrical junction is formed and said indicia means is energized.
Claim 2
Dependent Claim
176 words
In combination, with a metallurgical heating system including: a vessel, having a refractory lining, for containing material being processed; said refractory lining having a face forming a portion of the interior surface of said vessel; indicia apparatus circuitry for indicating when a preselected extent of wear of said lining is reached without interrupting the operation of said system, which apparatus circuitry is normally electrically open and comprises: a. external indicia means for producing an electrically generated signal; b. a pair of conductor members disposed in said lining and electrically connected to said indicia means; c. at least one of said members extending toward, but short of said face, to a preselected point for which a signal is desired, when the refractory lining covering said one member wears and said one member is exposed to the interior of said vessel; d. said conductor members being spaced apart and positioned in said refractory lining and of a type such that when electrically conductive material bridges said members an electrical junction is formed and said indicia means is energized.
Claim 3
Dependent Claim
31 words
The combination, as described in claim 1, wherein: said one conductor is positioned for exposure to the interior of said vessel when the maximum tolerable wear of the refractory lining occurs.
Claim 4
Dependent Claim
38 words
The combination, as described in claim 1, wherein: said vessel is adapted to contain a molten steelmaking composition and said conductor members are positioned in an area generally corresponding to the normal slag forming line of the vessel.
Claim 5
Dependent Claim
19 words
The combination, as described in claim 1, wherein: conductor members are positioned in the bottom wall of said vessel
Claim 6
Dependent Claim
34 words
The combination, as described in claim 1, wherein: at least three conductors are disposed in said lining and at least two have their terminal portions at different positions in respect to said interior surface.
Claim 7
Dependent Claim
28 words
The combination, as described in claim 1, wherein: at least a portion of said material being processed is electrically conductive and forms means for bridging the conductor members.
Claim 8
Dependent Claim
26 words
The combination, as described in claim 1, wherein: An electrically conductive oxide is disposed on said refractory lining and forms means for bridging said conductor members.
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) | 1978-08-04 | 1979-02-03 | 1979-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-04 | 1983-02-03 | 1983-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-04 | 1987-02-03 | 1987-08-05 | $7700.00 | Window Closed / Lapsed |