US3639737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the change in the thermal energy of a flowing fluid
Assignee: Delta X Corp
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Filing: 1970-10-16
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Granted: 1972-02-01
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Expires: 1990-10-16
Abstract
Abstract An apparatus for measuring the change in the thermal energy of a flowing fluid in which the flow rate and differential temperature are measured by providing an accurate measurement with an analog converter receiving the differential temperature signals and providing pulses from an oscillator based upon the change in thermal energy each time a predetermined volume of fluid is measured. An analog comparator receiving a differential temperature signal from a temperature measuring means and also receiving a signal from a digital to analog converter which is reset each time a predetermined volume of fluid is measured by the flow rate measuring means with an oscillator providing output pulses, the output from the oscillator being controlled by the comparator and being connected to a counting means when the differential temperature signal is greater than the signal from the converter whereby the counting means gives a measurement in the change of thermal energy of the flowing fluid.
Inventors
- 👤 Fount E Mckee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:28
CPC Classifications
G; G01; G01K; G01K17/00; G01K17/06; G01K17/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
An apparatus for measuring the change in the thermal energy of a flowing fluid with a flow rate measuring means and a differential temperature measuring means comprising, an analog comparator, said comparator having two inputs, the first input receiving an analog signal from the temperature measuring means of the change in temperature of the fluid, a digital to analog converter having an output, an input and a reset, the output of the converter being connected to the second input of the comparator, the reset being actuated by the output of the flow rate measuring means when a predetermined volume of fluid is measured, an oscillator providing output pulses, the output from the oscillator being controlled by the output of said comparator, the output from the oscillator being controlled by the output of said comparator, the output from the oscillator being connected to the input of the converter when the first input of the comparator is greater than the second input, and counting means connected to the output of the oscillator and receiving pulses therefrom as a measurement of the change in thermal energy of the flowing fluid.
Claim 2
Independent Claim
187 words
An apparatus for measuring the change in the thermal energy of a flowing fluid with a flow rate measuring means and a differential temperature measuring means comprising, an analog comparator, said comparator having two inputs, the first input receiving an analog signal from the temperature measuring means of the change in temperature of the fluid, a digital to analog converter having an output, an input and a reset, the output of the converter being connected to the second input of the comparator, the reset being actuated by the output of the flow rate measuring means when a predetermined volume of fluid is measured, an oscillator providing output pulses, the output from the oscillator being controlled by the output of said comparator, the output from the oscillator being controlled by the output of said comparator, the output from the oscillator being connected to the input of the converter when the first input of the comparator is greater than the second input, and counting means connected to the output of the oscillator and receiving pulses therefrom as a measurement of the change in thermal energy of the flowing fluid.
Claim 3
Independent Claim
258 words
An apparatus for measuring the change in the thermal energy of a flowing fluid in which the flow rate is measured by a flow rate measuring means and a differential temperature measuring transducer having an output analog signal measuring the change in temperature of the fluid comprising, an analog comparator having first and second inputs, the first input of said comparator receiving the analog output signal from the temperature transducer measuring the change in temperature of the flowing fluid, a digital to analog converter having an input, an output and a reset, the output of which is connected to the second input of the comparator, means connected to the output of the flow rate measuring means and measuring the volume of the fluid flow and connected to the reset of the converter and actuating the reset upon a predetermined fluid volume measurement, an oscillator providing output pulses, switching means connected to the oscillator output, said switching means controlled by the output of the comparator and being closed when the temperature signal to the comparator is greater than the signal at the second input, the switching means being connected to the input of the converter providing a signal to the comparator which in turn allows the transmission of the oscillator pulses to the converter so long as the temperature signal is greater than the signal from the converter to the comparator, and counting means connected to the switching means whereby pulses received from the oscillator are a measurement of the change in the thermal energy of the flowing fluid.
Claim 4
Independent Claim
258 words
An apparatus for measuring the change in the thermal energy of a flowing fluid in which the flow rate is measured by a flow rate measuring means and a differential temperature measuring transducer having an output analog signal measuring the change in temperature of the fluid comprising, an analog comparator having first and second inputs, the first input of said comparator receiving the analog output signal from the temperature transducer measuring the change in temperature of the flowing fluid, a digital to analog converter having an input, an output and a reset, the output of which is connected to the second input of the comparator, means connected to the output of the flow rate measuring means and measuring the volume of the fluid flow and connected to the reset of the converter and actuating the reset upon a predetermined fluid volume measurement, an oscillator providing output pulses, switching means connected to the oscillator output, said switching means controlled by the output of the comparator and being closed when the temperature signal to the comparator is greater than the signal at the second input, the switching means being connected to the input of the converter providing a signal to the comparator which in turn allows the transmission of the oscillator pulses to the converter so long as the temperature signal is greater than the signal from the converter to the comparator, and counting means connected to the switching means whereby pulses received from the oscillator are a measurement of the change in the thermal energy of the flowing fluid.
Claim 5
Dependent Claim
12 words
The apparatus of claim 3 wherein the switching means is a NAND-gate.
Claim 6
Dependent Claim
45 words
The apparatus of claim 3 wherein the measuring means connected to the flow rate measuring means includes means counting the pulses from the flow rate measuring means and providing a reset pulse to the converter each time a predetermined volume of fluid has been measured.
Claim 7
Dependent Claim
45 words
The apparatus of claim 3 wherein said counting means includes, a binary coded decimal accumulator for counting the pulses from the oscillator, and an electromechanical counter connected to and actuated by the accumulator when a predetermined quantity of pulses has been counted by the accumulator.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |