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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 |
| 5663713 |
Control system |
Sep. 2, 1997 |
| 5656991 |
Apparatus for testing an actuatable restraint system |
Aug. 12, 1997 |
| 5650907 |
Circuit breaker |
Jul. 22, 1997 |
| 5648759 |
Failsafe voltage regulator with warning signal driver |
Jul. 15, 1997 |
| 5637998 |
Digital system for detecting angular position |
Jun. 10, 1997 |
| 5627759 |
Electrical energy meters having real-time power quality measurement and reporting capability |
May. 6, 1997 |
| 5623249 |
Video monitor motion sensor |
Apr. 22, 1997 |
| 5583731 |
Input or output device, for programmable automatic controllers to detect an electrical fault of the channels |
Dec. 10, 1996 |
| 5578987 |
Monitoring apparatus for an alarm device |
Nov. 26, 1996 |
| 5565851 |
Fluid level sensing systems |
Oct. 15, 1996 |
| 5561764 |
Computer able to determine whether or not a display is connected to it, in accordance with the status data stored in a register and method of detecting whether or not a display is connected to |
Oct. 1, 1996 |
| 5561605 |
Arc detection using current variation |
Oct. 1, 1996 |
| 5555483 |
Automatic power line monitor system |
Sep. 10, 1996 |
| 5537024 |
Circuit arrangement to detect a voltage |
Jul. 16, 1996 |
| 5534854 |
Fan failure alert for electronic equipment |
Jul. 9, 1996 |
| 5512837 |
Voltage drop detecting circuit |
Apr. 30, 1996 |
| 5457450 |
LED traffic signal light with automatic low-line voltage compensating circuit |
Oct. 10, 1995 |
| 5452223 |
Arc detection using current variation |
Sep. 19, 1995 |
| 5444431 |
Intrusion monitoring device |
Aug. 22, 1995 |
| 5422630 |
Continuous monitoring electrostatic discharge system |
Jun. 6, 1995 |
| 5420511 |
System for continuous monitoring of the electrical conduction of an AC power system |
May. 30, 1995 |
| 5416470 |
Contact judging circuit and contact judging method for impedance measuring apparatus |
May. 16, 1995 |
| 5402119 |
Multiple-input aircraft annunciator system |
Mar. 28, 1995 |
| 5394035 |
Rate of change comparator |
Feb. 28, 1995 |
| 5331314 |
Circuit for monitoring of loads |
Jul. 19, 1994 |
| 5315256 |
Fault detection circuit for use in determining the existence of a fault in any one of a plurality of DC loads |
May. 24, 1994 |
| 5313165 |
Temperature-compensated apparatus for monitoring current having controlled sensitivity to supply voltage |
May. 17, 1994 |
| 5307049 |
Alarm control method |
Apr. 26, 1994 |
| 5302944 |
Method and apparatus for the monitoring of the operation of linear and rotary encoders |
Apr. 12, 1994 |
| 5300924 |
Harmonic measuring instrument for AC power systems with a time-based threshold means |
Apr. 5, 1994 |
| 5296844 |
Electrical contact avoidance device |
Mar. 22, 1994 |
| 5293113 |
Test instrument for the display of electric voltages |
Mar. 8, 1994 |
| 5293156 |
Hand tool driven by DC battery with multiple level battery condition indicator |
Mar. 8, 1994 |
| 5289166 |
Voltage detector |
Feb. 22, 1994 |
| 5272445 |
Resistance tester utilizing regulator circuits |
Dec. 21, 1993 |
| 5265022 |
Engine protecting system |
Nov. 23, 1993 |
| 5248967 |
Method and apparatus for monitoring electrical devices |
Sep. 28, 1993 |
| 5243330 |
Fire detector system and method |
Sep. 7, 1993 |
| 5233329 |
Filter with hysteresis for trip point applications |
Aug. 3, 1993 |
| 5229651 |
Method and apparatus for line power monitoring for uninterruptible power supplies |
Jul. 20, 1993 |
| 5225811 |
Temperature limit circuit with dual hysteresis |
Jul. 6, 1993 |
| 5225808 |
Long range intruder sensor |
Jul. 6, 1993 |
| 5218339 |
Arrangement for monitoring a consumer in combination with an internal combustion engine and/or a motor vehicle |
Jun. 8, 1993 |
| 5218298 |
Two-terminal-hall-sensors monitoring system for providing decoded magnetic field amplitude signals and system diagnostic signals |
Jun. 8, 1993 |
| 5210527 |
Programmable spike detector |
May. 11, 1993 |
| 5182511 |
Detector circuit for detecting a phase signal of a polyphase alternator for a battery charge regulator in a motor vehicle, and utilization thereof |
Jan. 26, 1993 |
| 5175531 |
Battery condition monitoring system for batteries connected in parallel |
Dec. 29, 1992 |
| 5168236 |
Fault detection circuit for use in determining the existence of a fault in any one of a plurality of multi-phase loads |
Dec. 1, 1992 |
| 5140305 |
Speed sensor failure detection method and apparatus for an overspeed protection system |
Aug. 18, 1992 |
| 5130699 |
Digital battery capacity warning device |
Jul. 14, 1992 |
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