Patent US3745834A successfully refreshed from Google Patents.
US3745834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring temperature of molten metal
Assignee: British Iron and Steel Research Association BISRA
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Filing: 1972-01-19
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Granted: 1973-07-17
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Expires: 1992-01-19
Abstract
Abstract A device for measuring the temperature of molten steel extends through the wall of the steelmaking vessel. The device consists of a number of sapphire rods each in its own refractory tubes, and all within an outer refractory tube. The rods are formed of rod lengths offset with respect to the rod lengths of adjacent rods. Radiation from the molten steel is transmitted through the rods and displaced by a lens to a flexible radiation guide extending outside the vessel. Even if one of the rods cracks in use a useful temperature measurement can still be obtained by analysing the radiation in a ratio pyrometer.
Inventors
- 👤 S Veltze
- 👤 P English
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:01
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/02; G01J5/08; G01J5/0037; G01J5/004; G01J5/04; G01J5/041; G01J5/0806; G01J5/0818; G01J5/046; G01J5/048
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
87 words
In a device for measuring the temperature of molten metal in a vessel including means for transmitting radiation from said molten metal to means for analyzing said radiation, the improvement wherein said means for transmitting radiation from the molten metal comprise a plurality of generally parallel radiation permeable rods resistant to high temperature set in a refractory material so that the faces at one end of the rods are exposed in use to molten metal, each said rod consisting of a plurality of rod lengths butted together.
Claim 2
Dependent Claim
87 words
In a device for measuring the temperature of molten metal in a vessel including means for transmitting radiation from said molten metal to means for analyzing said radiation, the improvement wherein said means for transmitting radiation from the molten metal comprise a plurality of generally parallel radiation permeable rods resistant to high temperature set in a refractory material so that the faces at one end of the rods are exposed in use to molten metal, each said rod consisting of a plurality of rod lengths butted together.
Claim 3
Dependent Claim
26 words
A device as claimed in claim 1 in which the rod lengths of one rod are offset with respect to the rod lengths of another rod.
Claim 4
Dependent Claim
74 words
A device as claimed in claim 2 in which each rod is fitted into a refractory tube, each tube being made up of a number of tube lengths butted together, there being one tube length for each rod length, and each rod length being slightly offset with respect to its associated tube length so that a projecting rod length forms a spigot to be received in a socket formed by the adjacent tube length.
Claim 5
Dependent Claim
25 words
A device as claimed in claim 1 in which all the rods are contained within a refractory outer tube surrounded by a protective metal sheath.
Claim 6
Dependent Claim
15 words
A device as claimed in claim 1 in which there are at least three rods.
Claim 7
Dependent Claim
14 words
A device as claimed in claim 1 in which the rods are sapphire rods.
Claim 8
Dependent Claim
41 words
A device as claimed in claim 1 in which the faces of the rods remote from the exposed faces are disposed adjacent to a radiation transmitting element for displacing radiation emerging from any of the rods towards a single radiation exit.
Claim 9
Dependent Claim
53 words
A device as claimed in claim 1 in which the faces of the rods remote from the exposed faces are disposed adjacent to a radiation transmitting element for displacing radiation emerging from any of the rods to a single radiation exit, said exit being constituted by the end of a flexible radiation guide.
Claim 10
Dependent Claim
14 words
A device as claimed in claim 1 extending through a brick of refractory material.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |