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US4479026A
Expired / Lapsed
US
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Measuring resistor for a noise thermometer
Assignee: Forschungszentrum Jülich
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Filing: 1983-05-20
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Granted: 1984-10-23
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Expires: 2003-05-20
Abstract
Abstract A noise thermometer of the type in which a resistive sensing element is exposed to elevated temperatures and has a measuring circuit connected thereto so that the noise voltage output of the sensing element is detected. According to the invention this element is a rectangular parallelopiped, elongated or cubical, of lanthanum chromite, LaCrO 3 .
Inventors
- 👤 Heinz Brixy
- 👤 Detmar von Mallinckrodt
- 👤 Volker Justus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:43
CPC Classifications
H; H01; H01C; H01C7/00; H01C7/06; G; G01; G01K; G01K7/00; G01K7/30
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
36 words
In a noise thermometer wherein a resistive sensing element is exposed to an elevated temperature and the noise voltage output thereof is detected by a measuring circuit, the improvement wherein said element consists of lanthanum chromite.
Claim 2
Dependent Claim
36 words
In a noise thermometer wherein a resistive sensing element is exposed to an elevated temperature and the noise voltage output thereof is detected by a measuring circuit, the improvement wherein said element consists of lanthanum chromite.
Claim 3
Dependent Claim
17 words
The noise thermometer defined in claim 1 wherein said element has the configuration of a rectangular parallelopiped.
Claim 4
Dependent Claim
12 words
The noise thermometer defined in claim 2 wherein said element is elongated.
Claim 5
Dependent Claim
13 words
The noise thermometer defined in claim 2 wherein said element is a cube.
Claim 6
Dependent Claim
25 words
The noise thermometer defined in claim 2 wherein said element has dimensions such that the resistance of said element is substantially 10 ohms ±1 ohm.
Claim 7
Dependent Claim
25 words
The noise thermometer defined in claim 2 wherein said element has a temperature coefficient of resistivity at 1500° C. of less than 2×10 -4 /°K.
Claim 8
Dependent Claim
13 words
The noise thermometer defined in claim 2 wherein said element is a cylinder.
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) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |