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Class Information
Number: 340/661
Name: Communications: electrical > Condition responsive indicating system > Specific condition > Electrical characteristic > Voltage > Comparison
Description: Subject matter where the voltage is monitored by comparison with another voltage or a reference.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5121108 |
Circuit arrangement for monitoring two operating voltages |
Jun. 9, 1992 |
| 5119073 |
AC ripple meter |
Jun. 2, 1992 |
| 5079688 |
Transformerless power monitor circuit having means for electronically latching DC alarms |
Jan. 7, 1992 |
| 5077629 |
Switch with pre-alarms means |
Dec. 31, 1991 |
| 5047751 |
Power supply voltage monitoring circuit |
Sep. 10, 1991 |
| 5039978 |
Analog graphic display method and apparatus |
Aug. 13, 1991 |
| 5032827 |
Device for monitoring a variable electric signal and a component for such a device |
Jul. 16, 1991 |
| 5032826 |
Core monitor that uses rotor shaft voltages |
Jul. 16, 1991 |
| 5019996 |
Programmable power supply level detection and initialization circuitry |
May. 28, 1991 |
| 5017874 |
Method and apparatus for detecting and indicating anomalies in the operation of the ignition systems of internal combustion engines |
May. 21, 1991 |
| 5001364 |
Threshold crossing detector |
Mar. 19, 1991 |
| 4996520 |
Overvoltage detection test apparatus for military aircraft weapons systems |
Feb. 26, 1991 |
| 4994792 |
Fluid temperature monitoring system |
Feb. 19, 1991 |
| 4983954 |
Shock hazard warning device |
Jan. 8, 1991 |
| 4983955 |
Electric power supply circuit monitoring systems |
Jan. 8, 1991 |
| 4977530 |
Voltage monitor for in-circuit testing |
Dec. 11, 1990 |
| 4962350 |
Load condition detecting and driving system |
Oct. 9, 1990 |
| 4951030 |
Monitoring system |
Aug. 21, 1990 |
| 4929886 |
Apparatus for detecting noise in the measurement of very small resistance |
May. 29, 1990 |
| 4916570 |
Voltage comparator circuit for monitoring a process output voltage within a preset range |
Apr. 10, 1990 |
| 4879625 |
Voltage monitor |
Nov. 7, 1989 |
| 4876622 |
Circuit breaker warning relay and control accessory |
Oct. 24, 1989 |
| 4862287 |
Power line monitor and printer system |
Aug. 29, 1989 |
| 4862142 |
Circuit with memory for detecting intermittent changes in resistance, current, voltage, continuity, power interruption, light, and temperature |
Aug. 29, 1989 |
| 4855721 |
Alarm apparatus for a freezer |
Aug. 8, 1989 |
| 4855722 |
Alternating current power loss detector |
Aug. 8, 1989 |
| 4839605 |
Signal compensation circuits |
Jun. 13, 1989 |
| 4839633 |
Asymmetric voltage monitor for series supplies |
Jun. 13, 1989 |
| 4835513 |
Method and apparatus for testing an airbag restraint system |
May. 30, 1989 |
| 4800368 |
Pyroelectric detector arrangement |
Jan. 24, 1989 |
| 4797655 |
Detector system for monitoring a fluid containing tube |
Jan. 10, 1989 |
| 4785294 |
Static monitoring system |
Nov. 15, 1988 |
| 4764839 |
Low voltage reset circuit |
Aug. 16, 1988 |
| 4761639 |
Lightweight, compact detector of sudden changes in concentration of a gas |
Aug. 2, 1988 |
| 4754407 |
Digital phase synchronizer |
Jun. 28, 1988 |
| 4745399 |
Device for generating an alarm signal in the event of an environmental abnormality |
May. 17, 1988 |
| 4736157 |
Wide-range resistance monitoring apparatus and method |
Apr. 5, 1988 |
| 4717997 |
Abnormal condition detective circuit for a switching regulator |
Jan. 5, 1988 |
| 4703259 |
Forward and reflected power measurement and display |
Oct. 27, 1987 |
| 4697169 |
Device for detecting and localizing a fault in an aerial rope-way transport installation |
Sep. 29, 1987 |
| 4683464 |
Safety monitor means and method |
Jul. 28, 1987 |
| 4675664 |
Alarm system and method for detecting proximity of an object to electrical power lines |
Jun. 23, 1987 |
| 4667186 |
Phase difference fault detector |
May. 19, 1987 |
| 4660027 |
Reduced power consumption low battery alert device |
Apr. 21, 1987 |
| 4654645 |
Electric element breakdown detector |
Mar. 31, 1987 |
| 4651084 |
Fault test apparatus for conductors of multiconductor cable |
Mar. 17, 1987 |
| 4638304 |
Environmental abnormality detecting apparatus |
Jan. 20, 1987 |
| 4634971 |
Portable hand-held voltage sensor with manually adjustable reference voltage for comparison with sensed voltage |
Jan. 6, 1987 |
| 4628303 |
Visual monitor for electrical signals |
Dec. 9, 1986 |
| 4626831 |
Analog signal processing circuit |
Dec. 2, 1986 |
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