US4216028A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermocouple protecting tube
Assignee: Koransha Co Ltd
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Filing: 1978-08-09
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Granted: 1980-08-05
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Expires: 1998-08-09
Abstract
Abstract The thermocouple protecting tube of this invention is characterized by having a heat-insulating layer in an annular space formed by and between an inner ceramic tube and an outer silica glass tube which are concentrically disposed within each other. Due to the above construction, the protecting tube can withstand the thermal shock which it receives when immersed in a molten body of high temperature and accordingly the thermocouple enclosed in the protecting tube can continuously measure the temperature of molten steel for a considerable length of time.
Inventors
- 👤 Sumihiko Kurita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:56
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/08; G01K1/12; G01K1/125
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
76 words
In a thermocouple protecting tube for continuously measuring the temperature of molten steel comprising a single ceramic tube having one end closed and containing a thermocouple element therein, the improvement wherein said tube is comprised of chromium oxide in an amount of about 1 to 35% by weight and alumina in an amount of about 99 to 65% by weight, said chromium oxide and alumina being initially mixed together and sintered to form said ceramic tube.
Claim 2
Dependent Claim
76 words
In a thermocouple protecting tube for continuously measuring the temperature of molten steel comprising a single ceramic tube having one end closed and containing a thermocouple element therein, the improvement wherein said tube is comprised of chromium oxide in an amount of about 1 to 35% by weight and alumina in an amount of about 99 to 65% by weight, said chromium oxide and alumina being initially mixed together and sintered to form said ceramic tube.
Claim 3
Dependent Claim
81 words
In a thermocouple protecting tube comprising a single ceramic tube having one end closed and containing a thermocouple element therein, said tube being comprised of chromium oxide in an amount of about 1 to 35% by weight and alumina in an amount of about 99 to 65% by weight, said chromium oxide and alumina being initially mixed together and sintered to form said ceramic tube, said tube having heat resistant properties suitable for use in measuring the temperature of molten steel.
Claim 4
Dependent Claim
81 words
In a thermocouple protecting tube comprising a single ceramic tube having one end closed and containing a thermocouple element therein, said tube being comprised of chromium oxide in an amount of about 1 to 35% by weight and alumina in an amount of about 99 to 65% by weight, said chromium oxide and alumina being initially mixed together and sintered to form said ceramic tube, said tube having heat resistant properties suitable for use in measuring the temperature of molten steel.
Claim 5
Dependent Claim
20 words
In a thermocouple protecting tube according to claim 1, wherein said tube has a diameter of less than 10 mm.
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) | 1983-08-05 | 1984-02-04 | 1984-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-05 | 1988-02-04 | 1988-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-05 | 1992-02-04 | 1992-08-05 | $7700.00 | Window Closed / Lapsed |