US3816183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature molten metal thermocouple
Assignee: M-R OHIO Inc A OHIO CORP
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Filing: 1972-09-26
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Granted: 1974-06-11
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Expires: 1992-09-26
Abstract
Abstract A non-splash temperature measuring device for repeated immersion in molten metal is disclosed. The immersion end includes a vacuum cast sleeve of refractory fibers having low density and a low rate of thermal conductivity, while having high temperature stability and being capable of resisting thermal shock.
Inventors
- 👤 M Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:46
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/08; G01K1/12; G01K1/125
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
A device in accordance with claim 1 wherein said tube is made of paper material and is at least as long as said sleeve.
Claim 2
Dependent Claim
30 words
A device in accordance with claim 1 wherein said sleeve projects beyond said one end of said tube for a distance corresponding generally to the thickness of said refractory material.
Claim 3
Dependent Claim
25 words
A device in accordance with claim 1 wherein said sleeve is a vacuum cast preformed sleeve shorter in length than the length of said tube.
Claim 4
Dependent Claim
27 words
A device in accordance with claim 1 wherein said tube has a thermal coefficient of conductivity of between 0.9 and 1.3 BTU in/* F-hr ft2 at 1,500*F.
Claim 5
Dependent Claim
22 words
A device in accordance with claim 1 wherein said refractory material is made from the same refractory fibers used in said sleeve.
Claim 6
Dependent Claim
17 words
A device in accordance with claim 1 wherein said sleeve has a snug fit over said tube.
Claim 7
Dependent Claim
45 words
A device in accordance with claim 1 including a spacer between said tube and sleeve to define an air gap between the outer periphery of the tube and the inner periphery of the sleeve, and means for preventing molten metal from entering said air gap.
Claim 8
Dependent Claim
105 words
A temperature measuring device suitable for immersion into molten metal at a temperature of about 2,400*-3,100* F., comprising a non-metallic support tube, a thermocouple unit having a main portion supported by said tube within one end thereof, a sleeve carried by said tube, said sleeve surrounding said main portion of said thermocouple unit, said sleeve being formed from refractory fibers of which about 90-98 percent are alumina-silica held together by a binder, and thermal insulating means bonding said tube and said sleeve at said one end of said tube and overlying the end faces of said one end of said tube and said main portion.
Claim 9
Dependent Claim
16 words
A device in accordance with claim 9 wherein said means is a layer of refractory material.
Claim 10
Dependent Claim
30 words
A device in accordance with claim 10 wherein said sleeve projects beyond said one end of said tube for a distance corresponding generally to the thickness of said refractory material.
Claim 11
Dependent Claim
46 words
A device in accordance with claim 9 wherein said sleeve is a vacuum cast sleeve having a density of 10 to 40 pounds per cubic foot, a melting point in excess of 3,000*F, and a thermal conductivity of 0.5 to 1.6 BTU in/*F-hr ft2 at 1,500*F.
Claim 12
Dependent Claim
23 words
A device in accordance with claim 9 wherein said tube is of paper material and is at least as long as said sleeve.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |