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Class Information
Number: 340/532
Name: Communications: electrical > Condition responsive indicating system > With particular coupling link > Having particular safety function
Description: Subject matter wherein the particular communication link has a specific limitation to enable safe operation in a particular environment (e.g., in the presence of explosive vapor).
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7592923 |
Smoke detection and laser escape indication system utilizing a control master with base and satellite stations |
Sep. 22, 2009 |
| 7576659 |
Smoke detection and laser escape indication system utilizing base and satellite |
Aug. 18, 2009 |
| 7531007 |
Security apparatus using a telecommunication device |
May. 12, 2009 |
| 7480536 |
Method for assessing reliability requirements of a safety instrumented control function |
Jan. 20, 2009 |
| 7456753 |
Internal pressure explosion-proof system |
Nov. 25, 2008 |
| 7398097 |
Dual-mesh network and communication system for emergency services personnel |
Jul. 8, 2008 |
| 7388495 |
Integrated electronic article surveillance (EAS) and point of sale (POS) system and method |
Jun. 17, 2008 |
| 7377835 |
Personal multimedia communication system and network for emergency services personnel |
May. 27, 2008 |
| 7339458 |
Power line communications interface and surge protector |
Mar. 4, 2008 |
| 7263379 |
Communications network for emergency services personnel |
Aug. 28, 2007 |
| 7246028 |
Method for transmitting data from sensor to a control unit, and a corresponding sensor and control unit |
Jul. 17, 2007 |
| 7199721 |
Alarm shut off system |
Apr. 3, 2007 |
| 7191097 |
Method, apparatus, and system for assessing conditions |
Mar. 13, 2007 |
| 7079021 |
System to manually initiate an emergency shutdown test and collect diagnostic data in a process control environment |
Jul. 18, 2006 |
| 6999562 |
Security control and communication system and method |
Feb. 14, 2006 |
| 6919809 |
Optimization of building ventilation by system and zone level action |
Jul. 19, 2005 |
| 6856852 |
Method and means for controlling the operation of a machine based upon the wearing apparel by the machine operator |
Feb. 15, 2005 |
| 6756898 |
Network termination device, alarm transfer system and alarm transferring method |
Jun. 29, 2004 |
| 6724302 |
Method and apparatus for the safe manual operation of an automated security gate |
Apr. 20, 2004 |
| 6646549 |
Emergency call network and system with graphical user interface |
Nov. 11, 2003 |
| 6614347 |
Apparatus and method for providing alarm synchronization among multiple alarm devices |
Sep. 2, 2003 |
| 6556915 |
System and method for controlling vehicle cruise speed |
Apr. 29, 2003 |
| 6397322 |
Integrated intrinsically safe input-output module |
May. 28, 2002 |
| 6369716 |
System and method for controlling air quality in a room |
Apr. 9, 2002 |
| RE37255 |
Address setting means for fire detectors |
Jul. 3, 2001 |
| 6256558 |
Vehicle display system with drive enforcement control |
Jul. 3, 2001 |
| 6229432 |
Intelligent transceiver module particularly suited for power line control systems |
May. 8, 2001 |
| 6229449 |
Detector apparatus |
May. 8, 2001 |
| 6127924 |
Security system capable of locating a stolen car |
Oct. 3, 2000 |
| 6124795 |
Detector interconnect system |
Sep. 26, 2000 |
| 6091331 |
Emergency worker and fireman's dual emergency warning system |
Jul. 18, 2000 |
| 6018292 |
Emergency trunk release apparatus |
Jan. 25, 2000 |
| 5796341 |
Safety and security system for work area |
Aug. 18, 1998 |
| 5696487 |
Audible fire alarm apparatus |
Dec. 9, 1997 |
| 5666010 |
Safety system for machine tools |
Sep. 9, 1997 |
| 5659243 |
High isolation, power-on control circuit for aircraft external power connection |
Aug. 19, 1997 |
| 5315289 |
Anticipatory interactive protective system |
May. 24, 1994 |
| 5235320 |
Alarm system |
Aug. 10, 1993 |
| 5189392 |
Heating system shut-off system using detector and existing safety switch or fuel valve |
Feb. 23, 1993 |
| 5165107 |
Electronic delay timer and alarm system |
Nov. 17, 1992 |
| 5070320 |
Alarm system |
Dec. 3, 1991 |
| 4996517 |
Household alarm system |
Feb. 26, 1991 |
| 4988977 |
Address setting means for fire detectors |
Jan. 29, 1991 |
| 4952881 |
Electrical test device |
Aug. 28, 1990 |
| 4951029 |
Micro-programmable security system |
Aug. 21, 1990 |
| 4818970 |
Fire condition detection and control system for air moving and filtering units |
Apr. 4, 1989 |
| 4710751 |
Ground fault monitor circuit |
Dec. 1, 1987 |
| 4665385 |
Hazardous condition monitoring system |
May. 12, 1987 |
| 4542302 |
Potential equalizing apparatus |
Sep. 17, 1985 |
| 4535321 |
Method and system for monitoring faults in electrical circuits |
Aug. 13, 1985 |
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