US3699320A
Expired / Lapsed
US
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Temperature compensated liquid metering system and method
Assignee: Halliburton Co
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Filing: 1971-01-18
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Granted: 1972-10-17
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Expires: 1991-01-18
Abstract
Abstract Method and apparatus for correcting a manifestation of fluid flow for variations in the temperature of the fluid to provide an indication of volume corrected to a predetermined temperature. A novel transducer is provided through the utilization of a thermistor in the shunt arm of a parallel-T oscillator.
Inventors
- 👤 Carl W Zimmerman
- 👤 George V Copland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:00
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; G01F1/12; G01F1/125; G01F15/00; G01F15/02; G01F15/022; G01F15/024; G01K; G01K7/00; G01K7/16; G01K7/22; G01K7/24; G01K7/245
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
111 words
A method of measuring fluid flow where both flow rate and a physical condition of the fluid may be variable comprisiNg the steps of: a. generating a first digital signal having a pulse recurrence rate related to fluid flow; b. generating a second digital signal having a pulse recurrence rate related to a physical condition of the fluid; c. generating a third digital signal having a predetermined pulse recurrence rate; and, d. generating a series of pulses related in number to the difference between the number of pulses in the second and third digital signals during a time interval of predetermined duration commenced responsively to a pulse in said first signal.
Claim 2
Independent Claim
111 words
A method of measuring fluid flow where both flow rate and a physical condition of the fluid may be variable comprisiNg the steps of: a. generating a first digital signal having a pulse recurrence rate related to fluid flow; b. generating a second digital signal having a pulse recurrence rate related to a physical condition of the fluid; c. generating a third digital signal having a predetermined pulse recurrence rate; and, d. generating a series of pulses related in number to the difference between the number of pulses in the second and third digital signals during a time interval of predetermined duration commenced responsively to a pulse in said first signal.
Claim 3
Dependent Claim
25 words
The method of claim 1 including the further step of accumulating the pulses in the series of pulses during a succession of said time intervals.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein the time interval is terminated responsively to a pulse in the third signal.
Claim 5
Dependent Claim
46 words
The method of claim 1 including the steps of: counting the pulses in the third signal which are generated subsequently to a pulse in the first signal; and, terminating the time interval responsively to the counting of a predetermined number of pulses in the third signal.
Claim 6
Dependent Claim
84 words
A digital system comprising: a first source of electrical pulses having a repetition rate related to fluid flow; a second source of electrical pulses having a repetition rate related to a condition of the fluid; a third source of electrical pulses having a predetermined repetition rate; and means for determining the difference between the number of pulses from said second and third source of electrical pulses during a time interval of predetermined duration commenced by a pulse from said first source of electrical pulses.
Claim 7
Dependent Claim
84 words
A digital system comprising: a first source of electrical pulses having a repetition rate related to fluid flow; a second source of electrical pulses having a repetition rate related to a condition of the fluid; a third source of electrical pulses having a predetermined repetition rate; and means for determining the difference between the number of pulses from said second and third source of electrical pulses during a time interval of predetermined duration commenced by a pulse from said first source of electrical pulses.
Claim 8
Dependent Claim
19 words
The digital system of claim 5 wherein said determining means is responsive to a plurality of said time intervals.
Claim 9
Dependent Claim
38 words
The digital system of claim 5 including a fourth source of electrical pulses responsive to said first and third source of electrical pulses, said time interval being terminated by a pulse from said fourth source of electrical pulses.
Claim 10
Independent Claim
119 words
A system for correcting a fluid flow indication to an indication of fluid flow at a predetermined condition of the fluid comprising: means for generating a first series of electrical pulses having a pulse repetition rate related to fluid flow; means for generating a second series of electrical pulses having a pulse repetition rate related to a condition of the fluid; means for generating a third series of electrical pulses having a pre-determined pulse repetition rate; and means for generating a fourth series of electrical pulses related to the difference between the number of pulses in said second and third series of electrical pulses during periods of time initiated by a pulse in said first series of electrical pulses.
Claim 11
Independent Claim
119 words
A system for correcting a fluid flow indication to an indication of fluid flow at a predetermined condition of the fluid comprising: means for generating a first series of electrical pulses having a pulse repetition rate related to fluid flow; means for generating a second series of electrical pulses having a pulse repetition rate related to a condition of the fluid; means for generating a third series of electrical pulses having a pre-determined pulse repetition rate; and means for generating a fourth series of electrical pulses related to the difference between the number of pulses in said second and third series of electrical pulses during periods of time initiated by a pulse in said first series of electrical pulses.
Claim 12
Dependent Claim
29 words
The system of claim 8 wherein said subtracting means includes means for reducing the number of pulses in said second and third series of electrical pulses by different factors.
Claim 13
Dependent Claim
101 words
The system of claim 8 wherein said subtracting means includes: a subtractor; first gate means for applying pulses in said second series of electrical pulses to one input terminal of said subtractor when enabled; second gate means for applying pulses in said third series of electrical pulses to a second input terminal of said subtractor when enabled; and bistable means for enabling said first and second gate means in response to a pulse in said first series of electrical pulses and for disabling said first and second gate means in response to a pulse in said third series of electrical pulses.
Claim 14
Dependent Claim
106 words
The system of claim 10 wherein said subtracting means includes means for reducing the number of pulses in said second and third series of electrical pulses by different factors, and wherein said means for generating said second series of electrical pulses includes a condition responsive transducer comprising a parallel-T oscillator having a condition responsive element in the shunt leg of the frequency determining portion therEof, the impedance of said condition responsive element being non-linearly related to the condition in a manner which coacts with the non-linearity of said oscillator to thereby increase the linearization of the frequency response of the transducer with respect to the condition.
Claim 15
Dependent Claim
81 words
The system of claim 8 wherein said means for generating said second series of electrical pulses includes a condition responsive transducer comprising a parallel-T oscillator having a condition responsive element in the shunt leg of the frequency determining portion thereof, the impedance of said condition responsive element being non-linearly related to the condition in a manner which coacts with the non-linearity of said oscillator to thereby increase the linearization of the frequency response of the transducer with respect to the condition.
Claim 16
Dependent Claim
19 words
The system of claim 12 wherein the condition is temperature; and wherein the condition responsive element is a thermistor.
Claim 17
Dependent Claim
63 words
The system of claim 12 including: a source of voltage; an output terminal; means for applying voltage from said source to said oscillator and to said output terminal; switch means responsive to said oscillator for modifying the application of voltage from said source to said output terminal; and means for reducing the effect on said oscillator of voltage modifications on said output terminal.
Claim 18
Dependent Claim
19 words
The transducer of claim 14 wherein the condition is temperature; and wherein the condition responsive element is a thermistor.
Claim 19
Dependent Claim
65 words
A digital system comprising: first, second and third sources of electrical pulses; means for counting the difference between the number of pulses from said second and third sources of electrical pulses during a plurality of equal duration time intervals each commenced by a pulse from said first series and each terminated by a pulse from one of said second and third sources of electrical pulses.
Claim 20
Dependent Claim
65 words
A digital system comprising: first, second and third sources of electrical pulses; means for counting the difference between the number of pulses from said second and third sources of electrical pulses during a plurality of equal duration time intervals each commenced by a pulse from said first series and each terminated by a pulse from one of said second and third sources of electrical pulses.
Claim 21
Independent Claim
94 words
A method of measuring fluid flow where both flow rate and a physical condition of the fluid may be variable comprising the steps of: a. providing a first signal having a pulse recurrence rate related to fluid flow; b. providing a second signal related to a physical condition of the fluid; c. providing a third signal having a predetermined pulse recurrence rate; and, d. providing a series of pulses related in number to the second and third signals during a time interval of predetermined duration commenced responsively to a pulse in said first signal.
Claim 22
Independent Claim
94 words
A method of measuring fluid flow where both flow rate and a physical condition of the fluid may be variable comprising the steps of: a. providing a first signal having a pulse recurrence rate related to fluid flow; b. providing a second signal related to a physical condition of the fluid; c. providing a third signal having a predetermined pulse recurrence rate; and, d. providing a series of pulses related in number to the second and third signals during a time interval of predetermined duration commenced responsively to a pulse in said first signal.
Claim 23
Dependent Claim
25 words
The method of claim 17 including the further step of accumulating the pulses in the series of pulses during a succession of said time intervals.
Claim 24
Dependent Claim
16 words
The method of claim 17 wherein the time interval is terminated responsively to the third signal.
Claim 25
Independent Claim
89 words
A system for correcting a fluid flow indication to an indication of fluid flow at a predetermined condition of the fluid comprising: means for providing a first signal having a pulse repetition rate related to fluid flow; means for providing a second signal related to a condition of the fluid; means for providing a third signal having a predetermined pulse repetition rate; and means for providing a series of pulses related to said second and third signals during periods of time initiated by a pulse in said first signal.
Claim 26
Independent Claim
89 words
A system for correcting a fluid flow indication to an indication of fluid flow at a predetermined condition of the fluid comprising: means for providing a first signal having a pulse repetition rate related to fluid flow; means for providing a second signal related to a condition of the fluid; means for providing a third signal having a predetermined pulse repetition rate; and means for providing a series of pulses related to said second and third signals during periods of time initiated by a pulse in said first signal.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |