US3667296A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for determining the surface level of molten material in a mold
Assignee: Vodafone GmbH
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Filing: 1970-07-24
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Granted: 1972-06-06
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Expires: 1990-07-24
Abstract
Abstract The rising level of molten metal in a mold, pertaining, for example, to a continuous casting apparatus, is supervised by electrical resistance wire probes dipping into the mold and short circuited by the molten metal therein. The resistance change in the circuit is ascertained and used as level indication.
Inventors
- 👤 Peter Schiefer
- 👤 Bernd Findeisen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:25
CPC Classifications
B; B22; B22D; B22D11/00; B22D11/16; B22D11/18; B22D11/181; B22D11/186; G; G01; G01F; G01F23/00; G01F23/22; G01F23/24; G01F23/241
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
133 words
Apparatus for measuring the rising surface level of molten metal in a mold, comprising: a pair of resistance wire probes made of the same metal as the molten metal in the mold and disposed in parallel relationship and dipping into the mold to extend down to the vicinity of the bottom thereof; a source of electrical voltage potential connected to the wires of the pair to apply biasing voltage thereto, to provide current flow through the wire probes, there being a closed circuit established when the wire probes are interconnected by molten metal in the mold, the wire probes of the pair being connected in series in the circuit; and means connected for measuring the change in resistance in the circuit to obtain representation of rising level of molten metal in the mold.
Claim 2
Dependent Claim
133 words
Apparatus for measuring the rising surface level of molten metal in a mold, comprising: a pair of resistance wire probes made of the same metal as the molten metal in the mold and disposed in parallel relationship and dipping into the mold to extend down to the vicinity of the bottom thereof; a source of electrical voltage potential connected to the wires of the pair to apply biasing voltage thereto, to provide current flow through the wire probes, there being a closed circuit established when the wire probes are interconnected by molten metal in the mold, the wire probes of the pair being connected in series in the circuit; and means connected for measuring the change in resistance in the circuit to obtain representation of rising level of molten metal in the mold.
Claim 3
Dependent Claim
22 words
Apparatus as in claim 1, the wire probes stationarily disposed to dip into the mold, the circuit including a resistance measuring circuit.
Claim 4
Dependent Claim
133 words
Apparatus for measuring the rising surface level of molten metal in a mold, comprising; a pair of resistance wire probes, made of metal that melts in the molten metal in the mold and disposed in parallel relationship and dipping into the mold to extend down to the vicinity of the bottom thereof; a source of electrical voltage potential connected to the wires of the pair to apply biasing voltage thereto, to provide current flow through the wire probes, there being a closed circuit established when the wire probes are interconnected by molten metal in the mold, the wire probes of the pair being connected in series in the circuit; and means connected for measuring the change in resistance in the circuit to obtain representation of rising level of molten metal in the mold.
Claim 5
Dependent Claim
133 words
Apparatus for measuring the rising surface level of molten metal in a mold, comprising; a pair of resistance wire probes, made of metal that melts in the molten metal in the mold and disposed in parallel relationship and dipping into the mold to extend down to the vicinity of the bottom thereof; a source of electrical voltage potential connected to the wires of the pair to apply biasing voltage thereto, to provide current flow through the wire probes, there being a closed circuit established when the wire probes are interconnected by molten metal in the mold, the wire probes of the pair being connected in series in the circuit; and means connected for measuring the change in resistance in the circuit to obtain representation of rising level of molten metal in the mold.
Claim 6
Dependent Claim
22 words
Apparatus as in claim 3, the wire probes stationarily disposed to dip into the mold, the circuit including a resistance measuring circuit.
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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |