Patent US3745451A successfully refreshed from Google Patents.
US3745451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for detecting faults in twisted wires by sensing variations in my
Assignee: Nortel Networks Ltd
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Filing: 1972-03-06
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Granted: 1973-07-10
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Expires: 1992-03-06
Abstract
Abstract A detector for faults in twisted wires, the detector in the form of a coil or other sensing device positioned adjacent the twisted wires and sensitive to variations in the Mu of the wires. The sensing device is connected to an amplifying and detecting circuit arranged to react to an abrupt change in the amplitude of the signal from the sensing device.
Inventors
- 👤 F Goyette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:39
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/50; G01R31/58; G01R31/59; G01R31/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
180 words
In a machine for twisting together at least two wires, apparatus for detecting faults in said wires and adapted to stop said machine on occurrence of a fault, said apparatus comprising a coil positioned at an outlet position of said machine, said wires arranged to pass through said coil, said coil sensitive to variations in the Mu of said wires; a relay controlling the power supply to said machine; an electronic circuit for receiving signals from said coil; said electronic circuit comprising: an electronic oscillator, the amplitude of oscillations varied by variations in the Mu of said wires, and a detector responsive to oscillations from said oscillator to produce an output signal; an amplifier for amplifying signals in said electronic circuit; a delayed gain control for said amplifier, said gain control responsive to long term variations in oscillation amplitude to adjust the amplifier output to a predetermined level and nonresponsive to abrupt changes in oscillation amplitude; means for producing an output pulse on occurrence of said abrupt change in oscillation amplitude; and means for feeding said pulse to said relay.
Claim 2
Dependent Claim
180 words
In a machine for twisting together at least two wires, apparatus for detecting faults in said wires and adapted to stop said machine on occurrence of a fault, said apparatus comprising a coil positioned at an outlet position of said machine, said wires arranged to pass through said coil, said coil sensitive to variations in the Mu of said wires; a relay controlling the power supply to said machine; an electronic circuit for receiving signals from said coil; said electronic circuit comprising: an electronic oscillator, the amplitude of oscillations varied by variations in the Mu of said wires, and a detector responsive to oscillations from said oscillator to produce an output signal; an amplifier for amplifying signals in said electronic circuit; a delayed gain control for said amplifier, said gain control responsive to long term variations in oscillation amplitude to adjust the amplifier output to a predetermined level and nonresponsive to abrupt changes in oscillation amplitude; means for producing an output pulse on occurrence of said abrupt change in oscillation amplitude; and means for feeding said pulse to said relay.
Claim 3
Dependent Claim
14 words
In a machine as claimed in claim 1, means for stretching said output pulse.
Claim 4
Dependent Claim
50 words
In a machine as claimed in claim 2, time delay means connected between said pulse stretching means and said relay, said time delay means arranged to be actuated on starting of said machine and to prevent actuation of said relay by an output pulse for a predetermined period of time.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |