US3708784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Switch indicator module with single-wire control
Assignee: Bendix Corp
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Filing: 1971-01-06
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Granted: 1973-01-02
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Expires: 1991-01-06
Abstract
Abstract A control circuit has control means for issuing commands to a logic circuit to provide logic signals corresponding to the commands for controlling a device. An indicator circuit controlled by a signal when the device has not responded to a logic signal operates an indicator to indicate that the device has not responded to a command.
Inventors
- 👤 W Spencer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:51
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/18; G; G08; G08C; G08C25/00; G08C25/02; H01; H01H; H01H9/00; H01H9/16; H01H9/167
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
97 words
A control circuit for issuing commands to a device and for indicating whether the device has responded to a command, comprising control means for issuing the commands, a logic circuit including switching means controlled by the control means and providing logic signals corresponding to the commands for controlling the device, an indicator circuit including switching means operated by a signal when the device has not responded to a logic signal, and indicating means connected to said control means and to said indicator circuit and controlled thereby to indicate that the device has not responded to the command.
Claim 2
Dependent Claim
97 words
A control circuit for issuing commands to a device and for indicating whether the device has responded to a command, comprising control means for issuing the commands, a logic circuit including switching means controlled by the control means and providing logic signals corresponding to the commands for controlling the device, an indicator circuit including switching means operated by a signal when the device has not responded to a logic signal, and indicating means connected to said control means and to said indicator circuit and controlled thereby to indicate that the device has not responded to the command.
Claim 3
Dependent Claim
20 words
A circuit for issuing commands as described in claim 1 in which the control means is a manually operated switch.
Claim 4
Dependent Claim
19 words
A circuit for issuing commands as described in claim 1 in which the logic switching means is a transistor.
Claim 5
Dependent Claim
20 words
A circuit for issuing commands as described in claim 1 in which the indicator circuit switching means is a transistor.
Claim 6
Dependent Claim
40 words
A circuit for issuing commands as described in claim 1 in which the indicator circuit includes a voltage source for energizing the indicating means and energization of the indicating means is controlled by the control means and the indicator circuit.
Claim 7
Dependent Claim
30 words
A circuit for issuing commands as described in claim 1 including means for providing a signal to the indicator circuit when the device has not responded to a logic signal.
Claim 8
Dependent Claim
37 words
A circuit for issuing commands as described in claim 1 in which the control means and indicating means are remotely situated with respect to the remainder of the circuit and are connected thereto by a single lead.
Claim 9
Dependent Claim
21 words
A circuit as described in claim 7 having means for preventing issuance of a command should the single lead open circuit.
Claim 10
Dependent Claim
31 words
A circuit as described in claim 7 for use with circuit breakers and in which the logic signals correspond to trip and reset commands for tripping and resetting the circuit breakers.
Claim 11
Dependent Claim
32 words
A circuit breaker as described in claim 9 having means for providing a logic signal corresponding to a trip command for tripping the associated circuit breakers should the single lead open circuit.
Claim 12
Dependent Claim
20 words
A circuit as described in claim 1 in which the circuit has meaNs for providing a high noise level margin.
Claim 13
Dependent Claim
38 words
A circuit as described in claim 11 in which the means for providing a high noise level margin is a Zener diode connected in the logic circuit for preventing operation of the switching means in response to noise.
Claim 14
Dependent Claim
26 words
A circuit as described in claim 11 in which the means for providing a high noise level margin is a biasing voltage on the switching means.
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) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |