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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 |
| 4255669 |
Sensing apparatus |
Mar. 10, 1981 |
| 4255748 |
Bus fault detector |
Mar. 10, 1981 |
| 4251769 |
Indicator and limit value alarm device |
Feb. 17, 1981 |
| 4246572 |
Detection circuit with hysteresis |
Jan. 20, 1981 |
| 4241336 |
Method and apparatus for monitoring poly-phase currents in poly-phase equipment |
Dec. 23, 1980 |
| 4240077 |
Thermostat |
Dec. 16, 1980 |
| 4238696 |
Failsafe electrical circuitry |
Dec. 9, 1980 |
| 4235181 |
Automatic blower control system for inboard marine engines |
Nov. 25, 1980 |
| 4231026 |
Battery discharge level detection circuit |
Oct. 28, 1980 |
| 4228429 |
Alarm system having phase-sensitive bridge circuit |
Oct. 14, 1980 |
| 4222045 |
Capacitive shift fire detection device |
Sep. 9, 1980 |
| 4219702 |
Malfunction detector for a dictation system |
Aug. 26, 1980 |
| 4210906 |
Transient suppression and detection system with operational indicator means |
Jul. 1, 1980 |
| 4205307 |
Device for monitoring the function of electromagnets |
May. 27, 1980 |
| 4203095 |
Monitoring apparatus for direct wire alarm system |
May. 13, 1980 |
| 4201979 |
Conveying data signals between relatively rotatable units |
May. 6, 1980 |
| 4194195 |
Portable liquid level maintenance monitor system for vehicles |
Mar. 18, 1980 |
| 4173750 |
Incandescent lamp monitoring device |
Nov. 6, 1979 |
| 4163971 |
Systems for displaying analog values |
Aug. 7, 1979 |
| 4152656 |
Apparatus for monitoring an AC variable |
May. 1, 1979 |
| 4149160 |
Multi-input signal comparator and indicator circuit |
Apr. 10, 1979 |
| 4110687 |
Dual threshold logic probe |
Aug. 29, 1978 |
| 4109234 |
Anti skid fault detection circuit |
Aug. 22, 1978 |
| 4091292 |
Fail-safe monitor of d.c. voltage |
May. 23, 1978 |
| 4084156 |
Voltage monitoring circuit |
Apr. 11, 1978 |
| 4065758 |
Alarm detector responsive to rate of change of a monitored condition |
Dec. 27, 1977 |
| 4052717 |
Battery condition monitoring method and apparatus |
Oct. 4, 1977 |
| 4032094 |
Control of positioning system authority over aircraft control surfaces as a function of surface movement rate |
Jun. 28, 1977 |
| 4032853 |
Overdrive detector for radio frequency amplifier |
Jun. 28, 1977 |
| 4020479 |
Fire detector |
Apr. 26, 1977 |
| 4017724 |
Apparatus for measuring battery depletion by monitoring reductions in voltage |
Apr. 12, 1977 |
| 4010456 |
Low battery voltage indicator for a portable digital electronic instrument |
Mar. 1, 1977 |
| 4005365 |
Voltage comparator and indicating circuit |
Jan. 25, 1977 |
| 3999124 |
Reference quantity and unknown quantity comparator |
Dec. 21, 1976 |
| 3997869 |
Speed limit passing indicator |
Dec. 14, 1976 |
| 3991553 |
Low voltage battery indicator for a solid state watch |
Nov. 16, 1976 |
| 3991302 |
Method for detecting and isolating faults in digital and analog circuits with multiple infrared scanning under conditions of different stimuli |
Nov. 9, 1976 |
| 3987341 |
Open neutral protection |
Oct. 19, 1976 |
| 3979657 |
Battery monitor with automatic scale and recycle prevents |
Sep. 7, 1976 |
| 3974403 |
Digital data transmission system |
Aug. 10, 1976 |
| 3967133 |
Power supply means |
Jun. 29, 1976 |
| 3964276 |
Knitting error detecting apparatus for circular knitting machine |
Jun. 22, 1976 |
| 3959791 |
Digital display systems |
May. 25, 1976 |
| 3956697 |
Voltage detector for detecting different voltage levels in conductors of an electrical power line |
May. 11, 1976 |
| 3947753 |
Voltage regulator including an LED to provide a reference voltage |
Mar. 30, 1976 |
| 3938075 |
Exhaust gas sensor failure detection system |
Feb. 10, 1976 |
| 3932797 |
Self-testing battery discharge indicator |
Jan. 13, 1976 |
| 3930687 |
Signal generating circuit for anti-skid brake control apparatus |
Jan. 6, 1976 |
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