US3747408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature measurement
Assignee: British Steel Corp
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Filing: 1971-10-13
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Granted: 1973-07-24
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Expires: 1991-10-13
Abstract
Abstract The temperature of molten steel in a converter is measured by blasting an inert gas through a tube into the melt so as to provide a gas/liquid interface adjacent the end of the tube and measuring the temperature of the melt by sighting radiation pyrometer along the tube through the gas towards the interface. More particularly the gas is heated e.g. by a plasma arc, to a temperature approximating that of the melt. The tube may depend into the converter from above or it may extend through the wall of the vessel below the surface of the melt.
Inventors
- 👤 C Stanworth
- 👤 J Dixon
- 👤 D Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:36
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/02; G01J5/06; G01J5/061; G01J5/0037; G01J5/004; G01J5/04; G01J5/041; G01J5/05; G01J5/051
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
88 words
Apparatus for measuring the temperature of a molten metal in a vessel, comprising a tube having one end which contacts the melt, an inert gas source, heater means for preheating the gas to a temperature approximating that of the melt, pressure means for blasting the gas through the tube into the melt so as to create a gas/liquid interface adjacent the said one end of the tube, and a radiation pyrometer for measuring the temperature of the melt sighted along the tube through the gas towards the interface.
Claim 2
Dependent Claim
88 words
Apparatus for measuring the temperature of a molten metal in a vessel, comprising a tube having one end which contacts the melt, an inert gas source, heater means for preheating the gas to a temperature approximating that of the melt, pressure means for blasting the gas through the tube into the melt so as to create a gas/liquid interface adjacent the said one end of the tube, and a radiation pyrometer for measuring the temperature of the melt sighted along the tube through the gas towards the interface.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1, wherein the heater means comprises a plasma arc gun.
Claim 4
Dependent Claim
42 words
Apparatus according to claim 2, wherein the tube includes two channels, one of said channels containing the pyrometer and lying in alignment with the gas/liquid interface and the other channel communicating with the said one channel and containing the plasma arc gun.
Claim 5
Dependent Claim
14 words
Apparatus according to claim 1, wherein the radiation pyrometer is of the two-colour type.
Claim 6
Dependent Claim
21 words
Apparatus according to claim 4, wherein the tube projects through the vessel at a level below the surface of the melt.
Claim 7
Dependent Claim
16 words
Apparatus according to claim 4, wherein the tube is immersed into the surface of the melt.
Claim 8
Independent Claim
70 words
A method of measuring the temperature of a molten charge in a vessel comprising: preheating a gas inert to the melt to a temperature approximating that of the melt, blasting said gas through a tube into the melt to provide a gas/liquid interface adjacent the end of the tube, and measuring the temperature of the melt by a radiation pyrometer sighted along the tube through the gas towards the interface.
Claim 9
Independent Claim
70 words
A method of measuring the temperature of a molten charge in a vessel comprising: preheating a gas inert to the melt to a temperature approximating that of the melt, blasting said gas through a tube into the melt to provide a gas/liquid interface adjacent the end of the tube, and measuring the temperature of the melt by a radiation pyrometer sighted along the tube through the gas towards the interface.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |