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Class Information
Number: 340/511
Name: Communications: electrical > Condition responsive indicating system > With particular system function (e.g., temperature compensation, calibration) > Alarm system supervision > Threshold or window (e.g., of analog electrical level)
Description: Subject matter wherein the supervisory circuit is coupled to the primary alarm circuit and is responsive to the signal therein attaining a predetermined level or range of levels.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5517175 |
Potential adjusting sensor supervision circuit |
May. 14, 1996 |
| 5512890 |
Sensor connection system |
Apr. 30, 1996 |
| 5504473 |
Method of analyzing signal quality |
Apr. 2, 1996 |
| 5486811 |
Fire detection and extinguishment system |
Jan. 23, 1996 |
| 5485142 |
Remote monitor alarm system |
Jan. 16, 1996 |
| 5483222 |
Multiple sensor apparatus and method |
Jan. 9, 1996 |
| 5471194 |
Event detection system with centralized signal processing and dynamically adjustable detection threshold |
Nov. 28, 1995 |
| 5453733 |
Intrusion alarm with independent trouble evaluation |
Sep. 26, 1995 |
| 5444431 |
Intrusion monitoring device |
Aug. 22, 1995 |
| 5440293 |
Detector supervision apparatus and method |
Aug. 8, 1995 |
| 5428342 |
Analyzing system for operating condition of electrical apparatus |
Jun. 27, 1995 |
| 5372029 |
Method of monitoring the quality of an object or state |
Dec. 13, 1994 |
| 5309147 |
Motion detector with improved signal discrimination |
May. 3, 1994 |
| 5307049 |
Alarm control method |
Apr. 26, 1994 |
| 5293155 |
Interface for a supervised multi-input audible warning system |
Mar. 8, 1994 |
| 5281951 |
Fire alarm system and method employing multi-layer net processing structure of detection value weight coefficients |
Jan. 25, 1994 |
| 5260687 |
Combined method of determining fires |
Nov. 9, 1993 |
| 5243330 |
Fire detector system and method |
Sep. 7, 1993 |
| 5233329 |
Filter with hysteresis for trip point applications |
Aug. 3, 1993 |
| 5231608 |
Ultrasonic object detecting apparatus |
Jul. 27, 1993 |
| 5227764 |
Electromagnetic proximity sensor |
Jul. 13, 1993 |
| 5218339 |
Arrangement for monitoring a consumer in combination with an internal combustion engine and/or a motor vehicle |
Jun. 8, 1993 |
| 5172096 |
Threshold determination apparatus and method |
Dec. 15, 1992 |
| 5168262 |
Fire alarm system |
Dec. 1, 1992 |
| 5155467 |
Inclination angle detection apparatus and automobile theft alarm apparatus using the same |
Oct. 13, 1992 |
| 5155468 |
Alarm condition detecting method and apparatus |
Oct. 13, 1992 |
| 5153722 |
Fire detection system |
Oct. 6, 1992 |
| 5136275 |
Ground connection monitoring for airbag electrical igniter circuit |
Aug. 4, 1992 |
| 5128962 |
Line interface circuit and a method of testing such a circuit |
Jul. 7, 1992 |
| 5128653 |
Fire alarm system |
Jul. 7, 1992 |
| 5117219 |
Smoke and fire detection system communication |
May. 26, 1992 |
| 5105371 |
Environmental detection system useful for fire detection and suppression |
Apr. 14, 1992 |
| 5103209 |
Electronic article surveillance system with improved differentiation |
Apr. 7, 1992 |
| 5097249 |
Power status detecting apparatus |
Mar. 17, 1992 |
| 5086293 |
Line interruption supervisory device for a fire alarm system |
Feb. 4, 1992 |
| 5084696 |
Signal detection system with dynamically adjustable detection threshold |
Jan. 28, 1992 |
| 5084825 |
Process control with guard band and fault limit |
Jan. 28, 1992 |
| 5059953 |
Infrared overheat and fire detection system |
Oct. 22, 1991 |
| 5043703 |
Supervision of autodyne microwave motion-detection system |
Aug. 27, 1991 |
| 5030939 |
Multiple input signal checking circuit |
Jul. 9, 1991 |
| 5017906 |
Apparatus and method for combining analog detection signals to provide enhanced alarm integrity |
May. 21, 1991 |
| 5017905 |
Fire alarm system |
May. 21, 1991 |
| 4965548 |
Level indicator with alarm |
Oct. 23, 1990 |
| 4962368 |
Reliability and workability test apparatus for an environmental monitoring system |
Oct. 9, 1990 |
| 4923117 |
Microcomputer-controlled system with redundant checking of sensor outputs |
May. 8, 1990 |
| 4916432 |
Smoke and fire detection system communication |
Apr. 10, 1990 |
| 4912455 |
Alarm systems |
Mar. 27, 1990 |
| 4887291 |
System for annunciating emergencies |
Dec. 12, 1989 |
| 4885573 |
Diagnostic system for combustion controller |
Dec. 5, 1989 |
| 4881060 |
Fire alarm system |
Nov. 14, 1989 |
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