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Class Information
Number: 340/531
Name: Communications: electrical > Condition responsive indicating system > With particular coupling link
Description: Subject matter having specific connecting means between the sensing and indicating means.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4788527 |
Apparatus and method for device control using a two conductor power line |
Nov. 29, 1988 |
| 4777474 |
Alarm system for the hearing impaired |
Oct. 11, 1988 |
| 4772876 |
Remote security transmitter address programmer |
Sep. 20, 1988 |
| 4755792 |
Security control system |
Jul. 5, 1988 |
| 4754261 |
Security system |
Jun. 28, 1988 |
| 4754262 |
Multiplexed alarm system |
Jun. 28, 1988 |
| 4743887 |
Fault locating system and method |
May. 10, 1988 |
| 4742336 |
Portable intrusion detection warning system |
May. 3, 1988 |
| 4737770 |
Security system with programmable sensor and user data input transmitters |
Apr. 12, 1988 |
| 4737769 |
Fire detection alarm system |
Apr. 12, 1988 |
| 4734680 |
Detection system with randomized transmissions |
Mar. 29, 1988 |
| 4733223 |
Apparatus for monitoring a communications system |
Mar. 22, 1988 |
| 4733215 |
Remote control apparatus for a property protection device |
Mar. 22, 1988 |
| 4731810 |
Neighborhood home security system |
Mar. 15, 1988 |
| 4725819 |
Fire detection system |
Feb. 16, 1988 |
| 4724425 |
Security and alarm system |
Feb. 9, 1988 |
| 4694282 |
Security monitoring system |
Sep. 15, 1987 |
| 4692742 |
Security system with correlated signalling to selected satellite stations |
Sep. 8, 1987 |
| 4683459 |
Alarm system test annunciator |
Jul. 28, 1987 |
| 4682144 |
Light transmission system for trains |
Jul. 21, 1987 |
| 4673920 |
Fire alarm control and emergency communication system |
Jun. 16, 1987 |
| 4673974 |
Image transmission system |
Jun. 16, 1987 |
| 4670989 |
Touch probe using microwave transmission |
Jun. 9, 1987 |
| 4672365 |
Security system with digital data filtering |
Jun. 9, 1987 |
| 4665385 |
Hazardous condition monitoring system |
May. 12, 1987 |
| 4665384 |
Signal-transmitting junction unit of hazard alarm system |
May. 12, 1987 |
| 4661804 |
Supervised wireless security system |
Apr. 28, 1987 |
| 4660023 |
Locality supervision system |
Apr. 21, 1987 |
| 4658357 |
Time and accounting system |
Apr. 14, 1987 |
| 4654638 |
Security monitoring system |
Mar. 31, 1987 |
| 4652859 |
Alarm reporting system |
Mar. 24, 1987 |
| 4651139 |
Method for monitoring the drift of an anchored vessel and device for implementing the method |
Mar. 17, 1987 |
| 4647914 |
Security apparatus and system |
Mar. 3, 1987 |
| 4641127 |
Security and fire protection system |
Feb. 3, 1987 |
| 4635040 |
Fire detection alarm system |
Jan. 6, 1987 |
| 4631527 |
Transmitter-receiver coded security alarm system |
Dec. 23, 1986 |
| 4623876 |
Alarm system to transmit detection information detected by a detector due to a radio system |
Nov. 18, 1986 |
| H154 |
Flash prefire detector |
Nov. 4, 1986 |
| 4617561 |
Emergency light and smoke alarm system |
Oct. 14, 1986 |
| 4617555 |
Receiver for audible alarm |
Oct. 14, 1986 |
| 4616214 |
Security system |
Oct. 7, 1986 |
| 4612535 |
Add-on alert system |
Sep. 16, 1986 |
| 4611198 |
Security and communication system |
Sep. 9, 1986 |
| 4603325 |
Evaluation apparatus |
Jul. 29, 1986 |
| 4602246 |
Intruder detector apparatus |
Jul. 22, 1986 |
| 4602357 |
Coded acoustic alarm transmitter/receiver system |
Jul. 22, 1986 |
| 4598272 |
Electronic monitoring apparatus |
Jul. 1, 1986 |
| 4594581 |
Fire alarm system |
Jun. 10, 1986 |
| 4593274 |
Remote signalling apparatus, particularly suitable for remote surveillance purposes |
Jun. 3, 1986 |
| 4578671 |
Remote indicating low battery voltage enunciator method and apparatus |
Mar. 25, 1986 |
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