Patent US3818285A successfully refreshed from Google Patents.
US3818285A
Expired / Lapsed
US
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Temperature monitoring and control system
Assignee: Individual
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Filing: 1973-07-06
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Granted: 1974-06-18
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Expires: 1993-07-06
Abstract
Abstract An electronic control system for monitoring of temperature, and the control of a system that uses a thermocouple as a temperature sensor. The thermocouple voltage is first amplified and then compared to a time delayed voltage representative of the thermocouple''s previous condition. On a rising temperature, the output switch means and load are immediately operated. On a drop in temperature, the comparison of the thermocouple output with the previous condition of the thermocouple allows for immediate deenergization of the output switch means and load. This arrangement has utility in monitoring of burner flames, and advances the art by allowing the use of a thermocouple as a flame safeguard device.
Inventors
- 👤 K Carson
- 👤 A Rekai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:34
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/10; F23N5/102; G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; G05D23/20; G05D23/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
142 words
A temperature monitoring and control system including; power supply means adapted for operation of said system; temperature responsive means adapted to be exposed to a temperature to be monitored and providing a voltage which is responsive to said temperature; comparator switch means having input means including delay circuit means and said temperature responsive voltage with said comparator switch means being energized from said power supply means; said comparator switch means further including output circuit means; and output switch means having an input connected to said comparator switch means output circuit means and an output connected to control a load; said load being energized upon an increased temperature being sensed by said temperature responsive means, and being deenergized upon said temperature responsive voltage decreasing by said comparator switch means comparing the voltage of said delay circuit means to said temperature responsive means voltage.
Claim 2
Dependent Claim
142 words
A temperature monitoring and control system including; power supply means adapted for operation of said system; temperature responsive means adapted to be exposed to a temperature to be monitored and providing a voltage which is responsive to said temperature; comparator switch means having input means including delay circuit means and said temperature responsive voltage with said comparator switch means being energized from said power supply means; said comparator switch means further including output circuit means; and output switch means having an input connected to said comparator switch means output circuit means and an output connected to control a load; said load being energized upon an increased temperature being sensed by said temperature responsive means, and being deenergized upon said temperature responsive voltage decreasing by said comparator switch means comparing the voltage of said delay circuit means to said temperature responsive means voltage.
Claim 3
Dependent Claim
193 words
A temperature monitoring and control system, including; power supply means adapted for operation of said system; temperature responsive means adapted to be exposed to a temperature to be monitored and providing a voltage which is responsive to said temperature; amplifier means having input means and output means with said amplifier means being energized from said power supply means; said input means being connected to said temperature responsive means with said amplifier means being responsive to said temperature responsive means voltage to thereby have an amplified voltage output at said output means; comparator switch means having input means including delay circuit means connected to said amplifier means output and being energized from said power supply means; said comparator switch means further including output circuit means; and output switch means having an input connected to said comparator switch means output circuit means and an output connected to control load means; said load means being operated upon an increasing temperature being sensed by said temperature responsive means and beign reversably operated upon said temperature responsive means temperature decreasing by said comparator switch means comparing the voltage of said delay circuit means and said amplifier output voltage.
Claim 4
Dependent Claim
193 words
A temperature monitoring and control system, including; power supply means adapted for operation of said system; temperature responsive means adapted to be exposed to a temperature to be monitored and providing a voltage which is responsive to said temperature; amplifier means having input means and output means with said amplifier means being energized from said power supply means; said input means being connected to said temperature responsive means with said amplifier means being responsive to said temperature responsive means voltage to thereby have an amplified voltage output at said output means; comparator switch means having input means including delay circuit means connected to said amplifier means output and being energized from said power supply means; said comparator switch means further including output circuit means; and output switch means having an input connected to said comparator switch means output circuit means and an output connected to control load means; said load means being operated upon an increasing temperature being sensed by said temperature responsive means and beign reversably operated upon said temperature responsive means temperature decreasing by said comparator switch means comparing the voltage of said delay circuit means and said amplifier output voltage.
Claim 5
Dependent Claim
31 words
A temPerature monitoring and control system as described in claim 2 wherein said power supply means is a direct current power supply means, and said temperature responsive means is a thermocouple.
Claim 6
Dependent Claim
33 words
A temperature monitoring and control system as described in claim 3 wherein said delay circuit means includes a capacitor to charge to a voltage level indicative of the output voltage of said thermocouple.
Claim 7
Dependent Claim
23 words
A temperature monitoring and control system as described in claim 4 wherein said amplifier means is an operational amplifier including negative feedback means.
Claim 8
Dependent Claim
24 words
A temperature monitoring and control system as described in claim 5 wherein said comparator switch means includes an operational amplifier having positive feedback means.
Claim 9
Dependent Claim
51 words
A temperature monitoring and control system as described in claim 6 wherein said output circuit means includes a transistor circuit which is switched by the operation of said comparator switch means; said transistor circuit further including a light emitting diode which emits an indicator light when said load means is energized.
Claim 10
Dependent Claim
31 words
A temperature monitoring and control system as described in claim 1 wherein said power supply means is a direct current power supply means, and said temperature responsive means is a thermocouple.
Claim 11
Dependent Claim
32 words
A temperature monitoring and control system as described in claim 8 wherein delay circuit means includes a capacitor that charges to a voltage level indicative of the output voltage of said thermocouple.
Claim 12
Dependent Claim
24 words
A temperature monitoring and control system as described in claim 9 wherein said comparator switch means includes an operational amplifier having positive feedback means.
References Cited (Backward Citations)
US3131314A
Cited
US3671815A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |