Patent US3604957A successfully refreshed from Google Patents.
US3604957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature measurement having sensor and reference diodes at inputs of regenerative differential amplifier
Assignee: ELECTRONIC CONSTRUCTION CORP
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Filing: 1969-05-02
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Granted: 1971-09-14
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Expires: 1989-05-02
Abstract
Abstract A differential-temperature-sensing system including a temperature-sensing network having a linear voltage drop characteristic to provide a differential voltage input signal to an amplifier which is balanced to provide a set output voltage when the differential input voltage is zero and a monitoring network having a feedback circuit connected to the amplifier input to trigger the amplifier in response to a change in the set output voltage.
Inventors
- 👤 Otto G Satula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
G; G01; G01K; G01K7/00; G01K7/01; H; H03; H03F; H03F3/00; H03F3/34; H03F3/343
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
131 words
A differential-temperature-detecting system comprising a differential amplifier including means for balancing said amplifier to provide a predetermined output voltage and having a pair of inputs, a temperature reference probe and a remote temperature-sensing probe, said probes comprising semiconductor junctions having poles disposed in opposite directions with respect to respective inputs of said differential amplifier, said probes being connected to said amplifier inputs for providing a voltage signal in response to a change in temperature between the temperature at the reference probe and the temperature at the remote probe, a positive feedback circuit connected to trigger said amplifier to a stable high output condition in response to a small change in the set output voltage, and means to detect the change in output voltage from the predetermined output voltage of said amplifier.
Claim 2
Dependent Claim
131 words
A differential-temperature-detecting system comprising a differential amplifier including means for balancing said amplifier to provide a predetermined output voltage and having a pair of inputs, a temperature reference probe and a remote temperature-sensing probe, said probes comprising semiconductor junctions having poles disposed in opposite directions with respect to respective inputs of said differential amplifier, said probes being connected to said amplifier inputs for providing a voltage signal in response to a change in temperature between the temperature at the reference probe and the temperature at the remote probe, a positive feedback circuit connected to trigger said amplifier to a stable high output condition in response to a small change in the set output voltage, and means to detect the change in output voltage from the predetermined output voltage of said amplifier.
Claim 3
Dependent Claim
27 words
A temperature-sensing system according to claim 1 wherein said detecting means includes a voltage divider circuit and a diode connected between the amplifier and the voltage divide.
Claim 4
Dependent Claim
17 words
A temperature-sensing system according to claim 2 wherein said feedback circuit is connected to said voltage divide.
Claim 5
Dependent Claim
52 words
A temperature-sensing system according to claim 1 wherein each of the reference probe and the remote probe include a pair of diodes arranged to conduct current in the same direction, said diodes having linear forward voltage drop characteristics, said reference probe and said remote probe being matched in said voltage drop characteristics.
Claim 6
Dependent Claim
27 words
A temperature-sensing system according to claim 1 further comprising means to apply a voltage pulse to said amplifier to return the output voltage to said predetermined value.
References Cited (Backward Citations)
US2573661A
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US3028473A
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US3106647A
Cited
US3067340A
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US3395265A
Cited
US3421375A
Cited
US3465175A
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US3431508A
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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) | 1974-09-13 | 1975-03-15 | 1975-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-13 | 1979-03-15 | 1979-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-13 | 1983-03-15 | 1983-09-14 | $7700.00 | Window Closed / Lapsed |