US3673392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote terminal computing unit to compute b/a {33 {0 c values, for use by central computer
Assignee: Hydril LLC
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Filing: 1970-02-02
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Granted: 1972-06-27
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Expires: 1990-02-02
Abstract
Abstract A computing unit adapted for use in a computing system, but located proximate the parameter measurement location, comprises converter means that includes a digital to analog converter (and may also include an analog to digital converter); an input terminal for a variable A to be connected to the converter means to provide reference input, and an input terminal for a variable B to be connected to the converter means operating as a divider during a first time interval to produce an output representative of the quantity B/A; and an input terminal for a variable C to be connected to the digital to analog converter operating as a multiplier during a second time interval to produce an output representative of the quantity B/A X C.
Inventors
- 👤 Wayne E Holm
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:45
CPC Classifications
G; G06; G06J; G06J1/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
165 words
A computing unit comprising a. computing means for computing from analog input variables A,B and C an analog output representative of the quantity B/A X C, and including an ADC which includes a multiplying DAC, b. an input path for variable A to be connected to the computing means to provide reference input, and an input path for variable B to be connected to the computing means operating as a divider during a first time interval to produce a digital output representative of the quantity B/A, and c. an input path for a variable C to be connected to the multiplying DAC responsive to said digital output and operating as a multiplier during a second time interval to produce an analog output representative of the quantity B/A X C, d. The ADC including a comparator having inputs connected to the output of the multiplying DAC and to the variable B input path during the first time interval, and disconnected therefrom during the second time interval.
Claim 2
Dependent Claim
165 words
A computing unit comprising a. computing means for computing from analog input variables A,B and C an analog output representative of the quantity B/A X C, and including an ADC which includes a multiplying DAC, b. an input path for variable A to be connected to the computing means to provide reference input, and an input path for variable B to be connected to the computing means operating as a divider during a first time interval to produce a digital output representative of the quantity B/A, and c. an input path for a variable C to be connected to the multiplying DAC responsive to said digital output and operating as a multiplier during a second time interval to produce an analog output representative of the quantity B/A X C, d. The ADC including a comparator having inputs connected to the output of the multiplying DAC and to the variable B input path during the first time interval, and disconnected therefrom during the second time interval.
Claim 3
Dependent Claim
43 words
The unit of claim 1 wherein the paths for inputs C, B and A are respectively connected to means for measuring the absolute pressure, means for measuring differential pressure across an orifice and means for measuring temperature, of gas flowing through a pipeline.
Claim 4
Dependent Claim
24 words
The unit of claim 1 including circuitry connected in operative relation with the computing means for effecting derivation of the quantity (B/A X C)1/2.
Claim 5
Dependent Claim
45 words
A computing system including a central computer, and multiple computing units as defined in claim 3, each unit including an accumulator in which is stored digital data corresponding to the quantity (B/A X C)1/2, the computer operatively connected in scanning relation with the multiple accumulators.
Claim 6
Dependent Claim
129 words
A computing unit comprising a. computing means for computing from analog input variables A,B and C an analog output representative of the quantity B/A X C, and including an ADC which includes a multiplying DAC, b. an input path for a variable A to be connected to the ADC to provide reference input, and an input path for a variable B to be connected to the ADC operating as a divider during a first time interval to produce a digital output representative of the quantity B/A, and c. an input path for a variable C to be connected to the multiplying DAC responsive to said digital output and operating as a multiplier during a second time interval to produce an analog output representative of the quantity B/A X C.
Claim 7
Dependent Claim
129 words
A computing unit comprising a. computing means for computing from analog input variables A,B and C an analog output representative of the quantity B/A X C, and including an ADC which includes a multiplying DAC, b. an input path for a variable A to be connected to the ADC to provide reference input, and an input path for a variable B to be connected to the ADC operating as a divider during a first time interval to produce a digital output representative of the quantity B/A, and c. an input path for a variable C to be connected to the multiplying DAC responsive to said digital output and operating as a multiplier during a second time interval to produce an analog output representative of the quantity B/A X C.
Claim 8
Dependent Claim
43 words
The unit of claim 5 wherein the input paths for inputs C,B and A are respectively connected to means for measuring the absolute pressure, means for measuring differential pressure across an orifice and means for measuring temperature, of gas flowing through a pipeline.
Claim 9
Dependent Claim
47 words
The unit of claim 5 wherein the input paths A,B and C are connected to means for measuring AC power line voltage, means for measuring power line current and means for measuring cos phi where phi is the phase angle between said power line current and voltage.
Claim 10
Dependent Claim
32 words
The unit of claim 5 including an accumulator, and means for transmitting to the accumulator digital data corresponding to a version of the quantity B/A X C, for storage in the accumulator.
Claim 11
Dependent Claim
30 words
The unit of claim 8 including multiple units as defined, a central computer, and means for sequentially sampling the said data stored in the accumulators for transmission to the computer.
Claim 12
Dependent Claim
23 words
The unit of claim 5 including circuitry connected in operative relation with the ADC for effecting derivation of the quantity (B/A X C)1/2.
Claim 13
Dependent Claim
29 words
The unit of claIm 10 including an accumulator operatively connected with said circuitry for storing the quantity (B/A X C)1/2, to be sampled and transmitted to a central computer.
Claim 14
Dependent Claim
53 words
The unit of claim 10 wherein said ADC includes an output register operable as a shift register, and said circuitry includes an odd number generator, subtractor, and accumulator operatively connected with said output register to derive the digital quantity (B/A X C)1/2 from the quantity (B/A X C), for storage in the accumulator.
Claim 15
Dependent Claim
47 words
The unit of claim 10 wherein said circuitry includes a sample and hold amplifier and square root circuitry connected between the multiplying DAC output and an input terminal of the ADC whereby the ADC is operable to digitize the quantity (B/A X C)1/2 during another time interval.
Claim 16
Dependent Claim
35 words
The unit of claim 13 including switch structure and controls therefor operable to connect the sample and hold amplifier in series between said B variable input terminal and the ADC during said first time interval.
Claim 17
Dependent Claim
35 words
The unit of claim 14 wherein said switch means connects the sample and hold amplifier input with the DAC output and disconnects the sample and hold output from the ADC, during the second time interval.
Claim 18
Dependent Claim
32 words
The unit of claim 5 including circuitry including an algorithm control connected with the ADC to modify ADC functioning so as to produce a digital version of the quantity (B/A X C).
Claim 19
Dependent Claim
154 words
In apparatus for accumulating gas flow rate data from a plurality of gas flow line locations, the combination at each location comprising a. means for computing the quantity B/A X C in response to reception of input signals A, B and C corresponding to T, Delta P and P, said means including an ADC, where Delta P gas flow pressure differential across an orifice communicating with the line, P gas flow pressure in the line T gas temperature in the line b. said means operating upon at least two of the signals during a first time interval for producing and storing a resultant quantity, and said means operating upon said resultant quantity and the third of said signals during a second time interval for producing the quantity B X C/A and c. other means operatively connected with said computing means for receiving said quantity B X C/A and for deriving the square root thereof.
Claim 20
Dependent Claim
154 words
In apparatus for accumulating gas flow rate data from a plurality of gas flow line locations, the combination at each location comprising a. means for computing the quantity B/A X C in response to reception of input signals A, B and C corresponding to T, Delta P and P, said means including an ADC, where Delta P gas flow pressure differential across an orifice communicating with the line, P gas flow pressure in the line T gas temperature in the line b. said means operating upon at least two of the signals during a first time interval for producing and storing a resultant quantity, and said means operating upon said resultant quantity and the third of said signals during a second time interval for producing the quantity B X C/A and c. other means operatively connected with said computing means for receiving said quantity B X C/A and for deriving the square root thereof.
References Cited (Backward Citations)
US2912162A
Cited
US3247365A
Cited
US3315069A
Cited
US3351910A
Cited
US3376745A
Cited
US3407658A
Cited
US3445643A
Cited
US3573448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |