US3786473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiplexing circuit
Assignee: Telecommunication Engineering Corp
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Filing: 1972-11-01
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Granted: 1974-01-15
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Expires: 1992-11-01
Abstract
Abstract A circuit for transmission of power from a source over a line pair to a number of receivers connected to the line pair. Each receiver has a load device adapted for energization by the power source, and a circuit operable to change the impedance across the line pair from a first characteristic adapted for local power reception to a second characteristic adapted to cause remote actuation of a circuit in the source to connect power to the line pair.
Inventors
- 👤 J Trombly
- 👤 W Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:49
CPC Classifications
H; H04; H04Q; H04Q5/00
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
97 words
A power transmitting system including, in combination, a transmission line pair, a plurality of receivers each comprising first and second circuits, the first circuit having a first impedance and signal means operable to connect the first impedance across the line pair, the second circuit having a load device and comprising a second impedance connected across the line pair, and a power circuit comprising a source for a voltage, a power gate operable to connect the source to the line pair, and control means adapted to operate the power gate in response to operation of a signal means.
Claim 2
Dependent Claim
97 words
A power transmitting system including, in combination, a transmission line pair, a plurality of receivers each comprising first and second circuits, the first circuit having a first impedance and signal means operable to connect the first impedance across the line pair, the second circuit having a load device and comprising a second impedance connected across the line pair, and a power circuit comprising a source for a voltage, a power gate operable to connect the source to the line pair, and control means adapted to operate the power gate in response to operation of a signal means.
Claim 3
Dependent Claim
39 words
A power transmitting system according to claim 1, in which the control means include an operating circuit connected to the line pair and means operable thereby to operate the power gate in response to operation of a signal means.
Claim 4
Dependent Claim
16 words
A power transmitting system according to claim 2, in which the voltage has periodic zero transitions.
Claim 5
Dependent Claim
24 words
A power transmitting system according to claim 2, in which the control means are adpated to energize the line pair synchronously with said voltage.
Claim 6
Dependent Claim
48 words
A power transmitting system according to claim 2, in which the control means include a sensing gate having an operating circuit connected to the line pair, the sensing gate being operable by the operating circuit to operate the power gate in response to operation of a signal means.
Claim 7
Dependent Claim
41 words
A power transmitting system according to claim 2, in which the first impedance is smaller than the second impedance, the operating circuit being adapted to cause operation of the power gate when the first impedance is connected across the line pair.
Claim 8
Dependent Claim
16 words
A power transmitting system according to claim 6, in which the voltage has periodic zero transitions.
Claim 9
Dependent Claim
43 words
A power transmitting system according to claim 5, in which the first impedance is smaller than the second impedance below a threshold level, the operating circuit being adapted to operate the sensing gate when the first impedance is connected across the line pair.
Claim 10
Dependent Claim
16 words
A power transmitting system according to claim 8, in which the voltage has periodic zero transitions.
Claim 11
Dependent Claim
17 words
A power transmitting system according to claim 2, in which the operating circuit is polarity discriminating. conductivity
Claim 12
Dependent Claim
27 words
A power transmitting system according to claim 1, in which the first impedance has substantially greater conductivity below a predetermined threshold voltage level than the second imPedance.
Claim 13
Dependent Claim
74 words
A power transmitting system according to claim 5, in which the first impedance has substantially greater conductivity below a predetermined threshold voltage level than the second impedance and the sensing gate is operable by a flow of current through the first impedance during application of a voltage less than said threshold level across the line pair to cause the power gate to connect a voltage greater than said threshold level across the line pair.
Claim 14
Dependent Claim
29 words
A power transmitting system according to claim 12, in which the load device is operable only upon appearance of a voltage above said threshold level across the line pair.
Claim 15
Dependent Claim
53 words
A power transmitting system according to claim 2, in which the power circuit includes parallel-connected branch circuits connected to the source, one said branch circuit including the power gate and the line pair in series connection and the other said branch circuit including the operating circuit and the line pair in series connection.
Claim 16
Dependent Claim
16 words
A power transmitting system according to claim 14, in which the voltage has periodic zero transitions.
Claim 17
Dependent Claim
31 words
A power transmitting system according to claim 1, in which the control means comprise an impedance variable as a function of the magnitude of the impedance connected across the line pair.
Claim 18
Dependent Claim
30 words
A power transmitting system according to claim 5, in which the sensing gate is an impedance variable as a function of the magnitude of current flowing in the operating circuit.
Claim 19
Dependent Claim
23 words
A power transmitting system according to claim 1, in which the load devices in the receivers are energized exclusively by the power circuit.
Claim 20
Dependent Claim
24 words
A power transmitting system according to claim 1, in which the first and second impedances have mutually spaced current zero-crossings in their voltage-current characteristics.
References Cited (Backward Citations)
US3631448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |