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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 |
| 5923251 |
Phase control method for electronic tags and station and tag implementing said method |
Jul. 13, 1999 |
| 5920259 |
Motion detection with RFI/EMI protection |
Jul. 6, 1999 |
| 5920258 |
Alarm signal processing circuit |
Jul. 6, 1999 |
| 5917417 |
Smoke detection system |
Jun. 29, 1999 |
| 5914655 |
Self-compensating intruder detector system |
Jun. 22, 1999 |
| 5912618 |
System for detecting the presence of an electrically conductive object, particularly an integrated circuit on a chip card |
Jun. 15, 1999 |
| 5900806 |
Alarm sensor multiplexing |
May. 4, 1999 |
| 5883574 |
Arrangement for preventing disturbances in electronic alarm systems |
Mar. 16, 1999 |
| 5870022 |
Passive infrared detection system and method with adaptive threshold and adaptive sampling |
Feb. 9, 1999 |
| 5864286 |
Distributed intelligence alarm system having a two- tier monitoring process for detecting alarm conditions |
Jan. 26, 1999 |
| 5844494 |
Method of diagnosing errors in the production process of a synthetic filament yarn |
Dec. 1, 1998 |
| 5831524 |
System and method for dynamic adjustment of filtering in an alarm system |
Nov. 3, 1998 |
| 5818326 |
Early fire detection using temperature and smoke sensing |
Oct. 6, 1998 |
| 5815075 |
Fire dector including a non-volatile memory |
Sep. 29, 1998 |
| 5805063 |
Wireless security sensor transmitter |
Sep. 8, 1998 |
| 5798692 |
Digital compensation circuit for calibration of sensors |
Aug. 25, 1998 |
| 5793288 |
Intrusion alarm with independent trouble evaluation |
Aug. 11, 1998 |
| 5793293 |
Temperature sensing system for over-heat detection |
Aug. 11, 1998 |
| 5790042 |
Automobile multiplex data communication method and system capable of preventing chattering phenomenon of switching component |
Aug. 4, 1998 |
| 5786756 |
Method and system for the prevention of false alarms in a fire alarm system |
Jul. 28, 1998 |
| 5786755 |
Alarm escalation method |
Jul. 28, 1998 |
| 5783989 |
Alarm sensor multiplexing |
Jul. 21, 1998 |
| 5764142 |
Fire alarm system with smoke particle discrimination |
Jun. 9, 1998 |
| 5742230 |
Apparatus for triggering a warning device |
Apr. 21, 1998 |
| 5736928 |
Pre-processor apparatus and method |
Apr. 7, 1998 |
| 5729197 |
Automatic, self-triggering alarm processing system and method |
Mar. 17, 1998 |
| 5721529 |
Individual smoke detector with stored range of acceptable sensitivity |
Feb. 24, 1998 |
| 5715177 |
Terminal sensing device for a disaster prevention monitoring system |
Feb. 3, 1998 |
| 5708414 |
Sensitivity fault indication technique implemented in smoke detector system with self-diagnostic capabilities |
Jan. 13, 1998 |
| 5705978 |
Process control transmitter |
Jan. 6, 1998 |
| 5691703 |
Multi-signature fire detector |
Nov. 25, 1997 |
| 5689233 |
Emergency information offering system |
Nov. 18, 1997 |
| 5673020 |
Early stage fire detecting apparatus |
Sep. 30, 1997 |
| 5670937 |
Line monitor for two wire data transmission |
Sep. 23, 1997 |
| 5670938 |
Fire alarm device |
Sep. 23, 1997 |
| 5654896 |
Performance prediction method for semiconductor power modules and ICS |
Aug. 5, 1997 |
| 5640140 |
Alarm processing apparatus |
Jun. 17, 1997 |
| 5631629 |
Heartbeat communications |
May. 20, 1997 |
| 5629676 |
Alarm system |
May. 13, 1997 |
| 5627514 |
Fire detector and fire receiver |
May. 6, 1997 |
| 5623249 |
Video monitor motion sensor |
Apr. 22, 1997 |
| 5612674 |
High sensitivity apparatus and method with dynamic adjustment for noise |
Mar. 18, 1997 |
| 5594417 |
Fire alarm system |
Jan. 14, 1997 |
| 5581236 |
Methods and apparatus for intrusion detection having improved immunity to false alarms |
Dec. 3, 1996 |
| 5578988 |
Intrusion detection system having self-adjusting threshold |
Nov. 26, 1996 |
| 5565851 |
Fluid level sensing systems |
Oct. 15, 1996 |
| 5552763 |
Fire alarm system with sensitivity adjustment |
Sep. 3, 1996 |
| 5548277 |
Flame sensor module |
Aug. 20, 1996 |
| 5539396 |
Remote monitoring system for instrumentation |
Jul. 23, 1996 |
| 5534849 |
Time multiplexed, false alarm resistant magnetically actuated security system |
Jul. 9, 1996 |
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