Patent US3899782A successfully refreshed from Google Patents.
US3899782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for monitoring reaction end point
Assignee: Individual
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Filing: 1973-08-27
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Granted: 1975-08-12
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Expires: 1993-08-27
Abstract
Abstract An apparatus for monitoring the course of a reaction under elevated temperature conditions as determined by the temperature of the reaction mixture, and particularly as applied to the processes of rendering meat-scrap and bone, used kitchen greases and edible meat products, candy making, and similar industrial applications, comprises a kettle having means for heating, and means for monitoring the process to determine when the proper end point has been reached. The monitoring means comprises a solid state temperature sensing device positioned in the kettle to sense the temperature of the reaction mixture, electrical wire leads having high temperature insulation connecting the solid state device to a remote junction box, and a control box having an electronic circuit for amplifying the electrical signal current passing through the temperature sensing device, a milliammeter for displaying the temperature visually, and a relay energized through a silicon controlled rectifier for sounding audible and/or visual alarms when an end point has been reached. The temperature sensing device is connected in series with a variable resistor having a graduated scale and with a calibrating resistor so that a plurality of reaction kettles may be monitored and controlled by setting calibrated controls in the apparatus which has only a single alarm relay.
Inventors
- 👤 Everett L Miller
- 👤 Frank D Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 23:25
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/14; G01K1/02; G01K1/026; G01K7/00; G01K7/16; G01K7/22; G01K7/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
220 words
An apparatus for monitoring the course of a reaction carried out by heating reaction mixtures in a plurality of reaction kettles and sensing the attainment of a particular temperature by the reaction mixture in each kettle as indicative of a desired end point, said apparatus comprising: 1. means providing a direct current power supply, 2. an alarm circuit connected to said direct current comprising a common relay for all said kettles having alarm means connected to the contact points thereof, 3. a silicon controlled rectifier connected to the coil of said relay, 4. a probe mounted on the wall of each kettle 5. end point control means for each kettle connected across said direct current power supply comprising in series: a. a potentiometer having a graduated scale on its dial, b. a calibrating potentiometer, and c. a solid state thermoresistive temperature sensing device mounted in the end of each of said probes, the junction between each of said temperature sensing devices and the corresponding one of said potentiometers for each kettle being connected to the gate of said silicon controlled rectifier, whereby the calibrating potentiometer for each kettle may be adjusted so that the readings on the graduated scale potentiometers for each kettle are the same when the same end point is reached by the reaction mixture in each kettle.
Claim 2
Independent Claim
220 words
An apparatus for monitoring the course of a reaction carried out by heating reaction mixtures in a plurality of reaction kettles and sensing the attainment of a particular temperature by the reaction mixture in each kettle as indicative of a desired end point, said apparatus comprising: 1. means providing a direct current power supply, 2. an alarm circuit connected to said direct current comprising a common relay for all said kettles having alarm means connected to the contact points thereof, 3. a silicon controlled rectifier connected to the coil of said relay, 4. a probe mounted on the wall of each kettle 5. end point control means for each kettle connected across said direct current power supply comprising in series: a. a potentiometer having a graduated scale on its dial, b. a calibrating potentiometer, and c. a solid state thermoresistive temperature sensing device mounted in the end of each of said probes, the junction between each of said temperature sensing devices and the corresponding one of said potentiometers for each kettle being connected to the gate of said silicon controlled rectifier, whereby the calibrating potentiometer for each kettle may be adjusted so that the readings on the graduated scale potentiometers for each kettle are the same when the same end point is reached by the reaction mixture in each kettle.
Claim 3
Dependent Claim
39 words
An apparatus according to claim 1, wherein a milliammeter is provided for each kettle connected to monitor said thermoresistive temperature sensing device, thereby providing an indication of which keTtle has reached the end point when the common alarm sounds.
Claim 4
Dependent Claim
25 words
an alarm circuit connected to said direct current comprising a common relay for all said kettles having alarm means connected to the contact points thereof,
Claim 5
Dependent Claim
25 words
an alarm circuit connected to said direct current comprising a common relay for all said kettles having alarm means connected to the contact points thereof,
Claim 6
Dependent Claim
11 words
a silicon controlled rectifier connected to the coil of said relay,
Claim 7
Dependent Claim
11 words
a silicon controlled rectifier connected to the coil of said relay,
Claim 8
Dependent Claim
25 words
An apparatus according to claim 1, wherein said temperature sensing device is connected to a remote junction box by a tetrafluoroethlene resin insulated electrical line.
Claim 9
Dependent Claim
9 words
a probe mounted on the wall of each kettle
Claim 10
Dependent Claim
9 words
a probe mounted on the wall of each kettle
Claim 11
Dependent Claim
23 words
An Apparatus according to claim 1, wherein a Zener diode is provided across the terminals of said power supply to provide voltage regulation.
Claim 12
Dependent Claim
20 words
An apparatus according to claim 1, wherein said potentiometer having a graduated scale on its dial is a 10-turn potentiometer.
Claim 13
Dependent Claim
117 words
end point control means for each kettle connected across said direct current power supply comprising in series: a. a potentiometer having a graduated scale on its dial, b. a calibrating potentiometer, and c. a solid state thermoresistive temperature sensing device mounted in the end of each of said probes, the junction between each of said temperature sensing devices and the corresponding one of said potentiometers for each kettle being connected to the gate of said silicon controlled rectifier, whereby the calibrating potentiometer for each kettle may be adjusted so that the readings on the graduated scale potentiometers for each kettle are the same when the same end point is reached by the reaction mixture in each kettle.
Claim 14
Dependent Claim
117 words
end point control means for each kettle connected across said direct current power supply comprising in series: a. a potentiometer having a graduated scale on its dial, b. a calibrating potentiometer, and c. a solid state thermoresistive temperature sensing device mounted in the end of each of said probes, the junction between each of said temperature sensing devices and the corresponding one of said potentiometers for each kettle being connected to the gate of said silicon controlled rectifier, whereby the calibrating potentiometer for each kettle may be adjusted so that the readings on the graduated scale potentiometers for each kettle are the same when the same end point is reached by the reaction mixture in each kettle.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |