US3818762A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase change detector cup
Assignee: M-R OHIO Inc A OHIO CORP
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Filing: 1972-04-05
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Granted: 1974-06-25
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Expires: 1992-04-05
Abstract
Abstract The thermocouple support post in a phase change cup is made from or coated with a high alumina content refractory coating having an annealing point at approximately the solidus arrest temprature of molten metal so that the refractory is sufficiently plastic to accommodate forces resulting from shrinkage of the molten metal as it cools.
Inventors
- 👤 M Kraus
- 👤 M Baccellieri
- 👤 Clintock B Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:51
CPC Classifications
G; G01; G01N; G01N25/00; G01N25/02; G01N25/04; G01K; G01K13/00; G01K13/12; G01K13/125
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
171 words
Apparatus comprising a phase change detector cup which is open at the top, said cup having a bottom wall spaced from said open top, a thermocouple for detecting phase change of molten metal in the cup, means in the cup supporting the thermocouple so that the thermocouple hot junction is inside the cup spaced radially inwardly from the walls of the cup and so that the thermocouple has exposed portions outside the cup for electrical contact, said means including a refractory coating surrounding that portion of the thermocouple wires between said hot junction and the wall of the cup which supports the thermocouple and exposed for contact with molten metal, said refractory coating having an annealing point in the range of about 2,000*F. to 2,100*F. so as to be plastic in the temperature range of about 2,100*F to 2,450*F. and having a liquidus temperature in excess of 2,450*F. so that it does not liquify when mOlten metal is poured into the cup and accommodates to shrinkage of molten metal without fracture.
Claim 2
Dependent Claim
171 words
Apparatus comprising a phase change detector cup which is open at the top, said cup having a bottom wall spaced from said open top, a thermocouple for detecting phase change of molten metal in the cup, means in the cup supporting the thermocouple so that the thermocouple hot junction is inside the cup spaced radially inwardly from the walls of the cup and so that the thermocouple has exposed portions outside the cup for electrical contact, said means including a refractory coating surrounding that portion of the thermocouple wires between said hot junction and the wall of the cup which supports the thermocouple and exposed for contact with molten metal, said refractory coating having an annealing point in the range of about 2,000*F. to 2,100*F. so as to be plastic in the temperature range of about 2,100*F to 2,450*F. and having a liquidus temperature in excess of 2,450*F. so that it does not liquify when mOlten metal is poured into the cup and accommodates to shrinkage of molten metal without fracture.
Claim 3
Dependent Claim
41 words
Apparatus in accordance with claim 1 wherein said means includes a dual bore center post having said coating thereon, said post being supported by a wall of said cup, said thermocouple wires each extending through a bore of the center post.
Claim 4
Dependent Claim
30 words
Apparatus in accordance with claim 2 wherein said post is supported by said bottom wall, and a portion of the bottom wall adjacent the post being covered by said coating.
Claim 5
Dependent Claim
17 words
Apparatus in accordance with claim 1 wherein said thermocouple wires are individually coated with said refractory coating.
Claim 6
Dependent Claim
16 words
Apparatus in accordance with claim 1 wherein said coating has a liquidus temperature of about 2,800*F.
Claim 7
Dependent Claim
20 words
Apparatus in accordance with claim 1 wherein said coating is applied to substantially the entire inner surface of said cup.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |