US3747082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Systems with constant current generators for transmitting flow rate data
Assignee: M&J Valve Co
•
Filing: 1971-08-23
•
Granted: 1973-07-17
•
Expires: 1991-08-23
Abstract
Abstract System and method for transmitting a pulsating signal from a pipeline flowmeter to a station located remotely of the flowmeter. The pulsating flowmeter signal is converted to current pulses of constant magnitude, and these pulses are passed along a transmission line to the remotely located station where the line is terminated in a resistive load.
Inventors
- 👤 S Ottenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:55
CPC Classifications
G; G01; G01F; G01F15/00; G01F15/06; G01F15/061; G01F15/063; G08; G08C; G08C19/00; G08C19/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
In a system for transmitting pipeline flow data to a remotely located station, flowmeter means for providing a pulse signal corresponding to the rate of flow in a pipeline, an electrically conductive transmission line extending between the flowmeter means and the remotely located station, first and second constant current generating means for delivering currents of opposite polarities to the transmission line when actuated, means responsive to the pulse signal for actuating the first generating means when the signal is above a predetermined level and actuating the second generating means when the signal is below said predetermined level, and resistive terminating means connected to the transmission line at said remotely located station.
Claim 2
Dependent Claim
111 words
In a system for transmitting pipeline flow data to a remotely located station, flowmeter means for providing a pulse signal corresponding to the rate of flow in a pipeline, an electrically conductive transmission line extending between the flowmeter means and the remotely located station, first and second constant current generating means for delivering currents of opposite polarities to the transmission line when actuated, means responsive to the pulse signal for actuating the first generating means when the signal is above a predetermined level and actuating the second generating means when the signal is below said predetermined level, and resistive terminating means connected to the transmission line at said remotely located station.
Claim 3
Dependent Claim
40 words
A flow data transmission system as in claim 1 including difference amplifier means for amplifying signals applied between its input terminals and cancelling signals common to said terminals, together with means for applying the pulse signal between the input terminals.
Claim 4
Dependent Claim
37 words
A flow data transmission system as in claim 1 wherein the resistive terminating means comprises a resistor having a value matched to the output impedance of the current generating means and the impedance of the transmission Line.
Claim 5
Dependent Claim
158 words
In a system for transmitting pipeline flow data over a transmission line to a remotely located station, flowmeter means for providing a pulse signal corresponding to the rate of flow in a pipeline, differential amplifier means having a pair of input terminals connected to the flowmeter means for amplifying the pulse signal and cancelling signals common to the input terminals, level sensing means responsive to the amplified pulse signal for switching from a first output state to a second output state when the pulse signal reaches a predetermined level and returning to the first state a predetermined time thereafter, and constant current generating means controlled by the level sensing means for delivering a substantially constant current of one polarity to the transmission line when the level sensing means is in its first output state and delivering a substantially constant current of the opposite polarity to the line when the level sensing means is in its second output state.
Claim 6
Dependent Claim
158 words
In a system for transmitting pipeline flow data over a transmission line to a remotely located station, flowmeter means for providing a pulse signal corresponding to the rate of flow in a pipeline, differential amplifier means having a pair of input terminals connected to the flowmeter means for amplifying the pulse signal and cancelling signals common to the input terminals, level sensing means responsive to the amplified pulse signal for switching from a first output state to a second output state when the pulse signal reaches a predetermined level and returning to the first state a predetermined time thereafter, and constant current generating means controlled by the level sensing means for delivering a substantially constant current of one polarity to the transmission line when the level sensing means is in its first output state and delivering a substantially constant current of the opposite polarity to the line when the level sensing means is in its second output state.
Claim 7
Dependent Claim
15 words
A system as in claim 4 wherein the level sensing means comprises a Schmitt trigger.
References Cited (Backward Citations)
US2084742A
Cited
US2729103A
Cited
US2755432A
Cited
US3349177A
Cited
US3359433A
Cited
US3425274A
Cited
US3497618A
Cited
US3497619A
Cited
US3530713A
Cited
US3476879A
Cited
US3550446A
Cited
US3681984A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |