US4274284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable phase change detector device
Assignee: L&N Metallurgical Products Co
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Filing: 1980-04-14
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Granted: 1981-06-23
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Expires: 2000-04-14
Abstract
Abstract An expendable phase change detector device is provided with an initial coating on the twisted wire forming the thermocouple junction which is, in turn, covered by a refractory coating during the manufacture of the device. The initial coating responds to an increased temperature to ablate the refractory coating from the thermocouple junction when molten metal is poured into the device.
Inventors
- 👤 Richard J. Hance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:19
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/12; G01K13/125; G01K1/00; G01K1/16; G01K1/18
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
An expendable phase change detector device for determining the composition of molten metal by thermal analysis, comprising: a cup, a thermocouple junction located in a central area of said cup, a refractory coating covering said thermocouple junction, and means responsive to the temperature of said thermocouple junction for ablating said refractory coating from said thermocouple junction when molten metal to be analyzed is poured into said cup and contacts said refractory coating on said thermocouple junction.
Claim 2
Dependent Claim
76 words
An expendable phase change detector device for determining the composition of molten metal by thermal analysis, comprising: a cup, a thermocouple junction located in a central area of said cup, a refractory coating covering said thermocouple junction, and means responsive to the temperature of said thermocouple junction for ablating said refractory coating from said thermocouple junction when molten metal to be analyzed is poured into said cup and contacts said refractory coating on said thermocouple junction.
Claim 3
Dependent Claim
42 words
A device as claimed in claim 1 in which said last named means is a material located on said thermocouple junction under said refractory coating which material produces a pressure within said coating to ablate said refractory coating at said thermocouple junction.
Claim 4
Dependent Claim
20 words
A device as claimed in claim 2 in which said material is a hydrocarbon having a low temperature boiling point.
Claim 5
Dependent Claim
18 words
A device as claimed in claim 2 in which said material has a large temperature coefficient of expansion.
Claim 6
Dependent Claim
69 words
A phase change detecting device for determining the composition of molten metal comprising: a cup, temperature sensing means located in a central area of said cup, a coating covering said temperature sensing means, means responsive to the temperature of said temperature sensing means for ablating said coating from said temperature sensing means when molten metal to be analyzed is poured into said cup and contacts said temperature sensing means.
Claim 7
Dependent Claim
69 words
A phase change detecting device for determining the composition of molten metal comprising: a cup, temperature sensing means located in a central area of said cup, a coating covering said temperature sensing means, means responsive to the temperature of said temperature sensing means for ablating said coating from said temperature sensing means when molten metal to be analyzed is poured into said cup and contacts said temperature sensing means.
Claim 8
Dependent Claim
124 words
An expendable phase change detecting device for determining the composition of a molten metal comprising: a cup having an opening through its end wall, a two-hole insulator axially mounted in said cup through said opening in said end wall of said cup and terminating in a central portion of said cup, a pair of thermocouple wires passing respectively through said two holes of said two-hole insulator, a thermocouple junction formed in said central portion of said cup by twisting together said thermocouple wires beyond the termination of said two-hole insulator, a temperature responsive ablative material applied to said thermocouple junction, and coating means containing a carbide stabilizer applied to all of the surfaces within said cup, including said two-hole insulator and said thermocouple junction.
Claim 9
Dependent Claim
124 words
An expendable phase change detecting device for determining the composition of a molten metal comprising: a cup having an opening through its end wall, a two-hole insulator axially mounted in said cup through said opening in said end wall of said cup and terminating in a central portion of said cup, a pair of thermocouple wires passing respectively through said two holes of said two-hole insulator, a thermocouple junction formed in said central portion of said cup by twisting together said thermocouple wires beyond the termination of said two-hole insulator, a temperature responsive ablative material applied to said thermocouple junction, and coating means containing a carbide stabilizer applied to all of the surfaces within said cup, including said two-hole insulator and said thermocouple junction.
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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) | 1984-06-22 | 1984-12-22 | 1985-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-22 | 1988-12-22 | 1989-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-22 | 1992-12-22 | 1993-06-23 | $7700.00 | Window Closed / Lapsed |