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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 |
| 4575711 |
Alarm terminal device |
Mar. 11, 1986 |
| 4574276 |
Indicating system |
Mar. 4, 1986 |
| 4563641 |
Radiation upset threshold detector apparatus |
Jan. 7, 1986 |
| 4559497 |
Ranged voltage monitor with out-of-range enunciators |
Dec. 17, 1985 |
| 4558275 |
Line voltage monitor system |
Dec. 10, 1985 |
| 4558310 |
Current sensing device and monitor |
Dec. 10, 1985 |
| 4543570 |
Detecting a rapid change of a critical physical condition |
Sep. 24, 1985 |
| 4543565 |
Method and apparatus for monitoring an alarm system |
Sep. 24, 1985 |
| 4543567 |
Method for controlling output of alarm information |
Sep. 24, 1985 |
| 4524317 |
Precision, dynamic low voltage measurement system |
Jun. 18, 1985 |
| 4523295 |
Power loss compensation for programmable memory control system |
Jun. 11, 1985 |
| 4523187 |
Alarm system for electric fences |
Jun. 11, 1985 |
| 4523143 |
Digital logic level comparator particularly for digital test systems |
Jun. 11, 1985 |
| 4520418 |
Reset circuit |
May. 28, 1985 |
| 4520318 |
Electric field strength indicator |
May. 28, 1985 |
| 4518062 |
Procedure and measuring circuit for stopping an elevator |
May. 21, 1985 |
| 4514720 |
Method and apparatus for increasing the response sensitivity and the interference resistance in an alarm system |
Apr. 30, 1985 |
| 4503479 |
Electronic circuit for vehicles, having a fail safe function for abnormality in supply voltage |
Mar. 5, 1985 |
| 4491968 |
Status monitor |
Jan. 1, 1985 |
| 4488110 |
Voltage monitor with visible level indicator |
Dec. 11, 1984 |
| 4470047 |
Bidirectional, interactive fire detection system |
Sep. 4, 1984 |
| 4459583 |
Alarm system |
Jul. 10, 1984 |
| 4428020 |
Power supply sensing circuitry |
Jan. 24, 1984 |
| 4423412 |
Industrial process indicating/recording apparatus using stepping motor drive |
Dec. 27, 1983 |
| 4410882 |
System for monitoring the ignition function of rapid extinguishing systems |
Oct. 18, 1983 |
| 4403213 |
Power supply diagnostic system |
Sep. 6, 1983 |
| 4399428 |
Thermostat |
Aug. 16, 1983 |
| 4398188 |
Ground circuit voltage detector |
Aug. 9, 1983 |
| 4366433 |
Output voltage-drop detecting apparatus technical field |
Dec. 28, 1982 |
| 4366474 |
Identification of electric power network phases experiencing disturbances |
Dec. 28, 1982 |
| 4359679 |
Switching d-c. regulator and load-sharing system for multiple regulators |
Nov. 16, 1982 |
| 4358755 |
Signal selection circuit |
Nov. 9, 1982 |
| 4348655 |
Control circuit for vehicle turn-signal flasher systems |
Sep. 7, 1982 |
| 4336532 |
Integrated nuclear radiation detector and monitor |
Jun. 22, 1982 |
| 4335378 |
Timed dual comparator alarm |
Jun. 15, 1982 |
| 4334188 |
Voltage detector using an oscillator and comparator means |
Jun. 8, 1982 |
| 4333050 |
Multiphase voltage monitor |
Jun. 1, 1982 |
| 4330777 |
Device for detecting imminent failure of high-dielectric stress capacitors |
May. 18, 1982 |
| 4318092 |
Means for checking battery voltage level |
Mar. 2, 1982 |
| 4316185 |
Battery monitor circuit |
Feb. 16, 1982 |
| 4311994 |
Signal level indication with different colors |
Jan. 19, 1982 |
| 4307389 |
Decoding circuit |
Dec. 22, 1981 |
| 4296278 |
Loudspeaker overload protection circuit |
Oct. 20, 1981 |
| 4291356 |
Apparatus for analyzing a physical quantity |
Sep. 22, 1981 |
| 4283717 |
Monitoring system for a direct-wire alarm system |
Aug. 11, 1981 |
| 4282517 |
Automatic ringback for direct current monitoring system |
Aug. 4, 1981 |
| 4280580 |
Proximity detector system for a medical diagnostic device |
Jul. 28, 1981 |
| 4278971 |
Electric control circuit for safety apparatus in automotive vehicles |
Jul. 14, 1981 |
| 4277782 |
Detection circuit and structure therefor |
Jul. 7, 1981 |
| 4263583 |
Digital alarm system with variable alarm hysteresis |
Apr. 21, 1981 |
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