Patent US3595081A successfully refreshed from Google Patents.
US3595081A
Expired / Lapsed
US
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Flowmeters
Assignee: Allard Way Holdings Ltd
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Filing: 1968-09-16
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Granted: 1971-07-27
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Expires: 1988-09-16
Abstract
Abstract A fluid flowmeter which gives an output pulse for each unit of fuel passing through the meter and which also gives pulses at a characteristic ''''zero flow'''' rate when no fluid is flowing. Inhibitor means are provided to prevent zero flow rate pulses from affecting the indicator means and in order to check the accuracy of the flowmeter switch means are provided for overriding the inhibitor means at will so that zero flow rate pulses may be used to give a flow rate indication.
Inventors
- 👤 William A Byars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:18
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/05; G01F1/10; G01F1/115; G01F1/11
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
208 words
A fluid flowmeter comprising transmitter means operative to develop an output characteristic of the rate of fluid flow therethrough, including zero and nonzero flow rates, with a zero flow rate giving rise to a characteristic output of the same general nature as the outputs for nonzero flow rates; indicator means; and data processing circuitry including processing means connected with said transmitter and effectively operative to process the transmitter output to develop or generate a signal having a parameter, the value of which represents the combined zero and nonzero flow rates through the transmitter, the zero flow rate giving a parameter value below a predetermined level, a logic circuit having an input side connected with the processing means and an output side connected with the indicator means, the logic circuit including means set at said predetermined level so as normally to pass said signal including said parameter to the indicator means only when its parameter value is above the predetermined level, and switch means provided to selectively override the logic circuit by providing a shunt path from the input to the output side to allow said signal to be passed to the indicator means even when the parameter value is below the predetermined level, representative of zero flow rate.
Claim 2
Dependent Claim
208 words
A fluid flowmeter comprising transmitter means operative to develop an output characteristic of the rate of fluid flow therethrough, including zero and nonzero flow rates, with a zero flow rate giving rise to a characteristic output of the same general nature as the outputs for nonzero flow rates; indicator means; and data processing circuitry including processing means connected with said transmitter and effectively operative to process the transmitter output to develop or generate a signal having a parameter, the value of which represents the combined zero and nonzero flow rates through the transmitter, the zero flow rate giving a parameter value below a predetermined level, a logic circuit having an input side connected with the processing means and an output side connected with the indicator means, the logic circuit including means set at said predetermined level so as normally to pass said signal including said parameter to the indicator means only when its parameter value is above the predetermined level, and switch means provided to selectively override the logic circuit by providing a shunt path from the input to the output side to allow said signal to be passed to the indicator means even when the parameter value is below the predetermined level, representative of zero flow rate.
Claim 3
Dependent Claim
38 words
A fluid flowmeter as claimed in claim 1 wherein the said signal is a pulsed signal and the said parameter is pulse length, the logic circuit comprising a timing circuit which passes only pulses above a predetermined length.
Claim 4
Dependent Claim
88 words
A fluid flowmeter as claimed in claim 2 wherein the transmitter means includes means for generating an output comprising two signal trains of equal frequency pulses, the delay between a pulse of one train and the next pulse of the other train being representative of flow rate, and the processing means comprising square wave pulse generator means connected to receive the two pulse trains and effective to generate in response thereto said signal which is a train of square pulses having a pulse duration corresponding to said delay.
Claim 5
Dependent Claim
117 words
A fluid flow meter as claimed in claim 1 wherein the data processing circuitry includes means operative in response to the transmitter output to generate, as part of said signals, discrete signals each of which represents the passage through the transmitter of a certain quantity of unit mass of fluid, said latter means including differentiating and steering means and bistable switch means connected in series with said logiC circuit; and the transmitter output for zero flow rate also being selectively capable of giving rise to said discrete signals; and the indicator means comprises a resetable indicator which is responsive to said discrete signals so as to indicate the quantity of fluid which has passed through the transmitter.
Claim 6
Dependent Claim
48 words
A fluid flowmeter as defined in claim 4 wherein said override switch means comprises a timing circuit bridgingly connected with said logic circuit, and a switch therein responsive to the timing circuit to be closed for a predetermined time period thereby when the timing circuit is rendered operative.
Claim 7
Dependent Claim
75 words
A fluid flowmeter as claimed in claim 5 wherein the indicator means comprises a resettable indicator, and reset means are provided comprising a second timing circuit connected to be activated by the first mentioned timing circuit at the termination of said predetermined period; and a gate which the second timing circuit is effective to open on being activated to allow the passage of resetting signals to the indicator to reset it to the datum value.
Claim 8
Dependent Claim
19 words
A fluid flowmeter as claimed in claim 5 wherein the or each timing circuit comprises a monostable circuit arrangement.
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) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |