Patent US4603980A successfully refreshed from Google Patents.
US4603980A
Expired / Lapsed
US
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Methods of measuring temperature and electrical resistivity in a molten glass stream
Assignee: Owens Corning Fiberglas Technology Inc
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Filing: 1985-08-02
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Granted: 1986-08-05
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Expires: 2005-08-02
Abstract
Abstract A small sensor electrode with only the tip exposed is used with a much larger return electrode to complete a high frequency circuit through molten glass. The sensor electrode is calibrated in the laboratory and then used to measure the resistivity of the molten glass. This sensor electrode consists of a type R thermocouple with which one can also measure the temperature of the thermocouple junction. Thus one can measure both the temperature and the resistance at a common point. These measurements are used to monitor the molten glass system.
Inventors
- 👤 James I. Berg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:13
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/07; C; C03; C03B; C03B5/00; C03B5/16; C03B5/24; G01K; G01K7/00; G01K7/02; G01K7/04; G01N33/00; G01N33/38; G01N33/386
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
142 words
A method of measuring the temperature and electrical resistivity of a molten glass stream using a signal generating means, a signal detector means with the improvement comprising: measuring simultaneously at substantially the same location the temperature and the electrical resistivity of said glass stream by using a pair of electrodes with extreme disparity in sizes between said pair of electrodes with a sensor electrode of said pair of electrodes having a diameter of 2 mm to 10 mm, a return electrode of said pair of electrodes having a surface area of at least 100 times that of said sensor electrode, said sensor electrode comprising as the conductor wires of a thermocouple having only the junction exposed to contact with said molten glass stream and with a signal sent from said signal generating means through said pair of electrodes to said detector means.
Claim 2
Independent Claim
142 words
A method of measuring the temperature and electrical resistivity of a molten glass stream using a signal generating means, a signal detector means with the improvement comprising: measuring simultaneously at substantially the same location the temperature and the electrical resistivity of said glass stream by using a pair of electrodes with extreme disparity in sizes between said pair of electrodes with a sensor electrode of said pair of electrodes having a diameter of 2 mm to 10 mm, a return electrode of said pair of electrodes having a surface area of at least 100 times that of said sensor electrode, said sensor electrode comprising as the conductor wires of a thermocouple having only the junction exposed to contact with said molten glass stream and with a signal sent from said signal generating means through said pair of electrodes to said detector means.
Claim 3
Dependent Claim
15 words
The method of claim 1 in which the thermocouple junction is a type R thermocouple.
Claim 4
Dependent Claim
20 words
The method of claim 1 in which the sensor electrode is 20 cm to 200 cm from the return electrode.
Claim 5
Dependent Claim
18 words
The method of claim 1 in which the main body of the sensor electrode is an alumina tube.
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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) | 1989-08-04 | 1990-02-03 | 1990-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-04 | 1994-02-03 | 1994-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-04 | 1998-02-03 | 1998-08-05 | $7700.00 | Window Closed / Lapsed |