Class 340/536 - Noninterfering

Subclass of Class 340 - Communications: electrical
Definition: Subject matter provided with means for preventing the transmission
No. of patents: 23
Last issue date: 06/24/2008

Number	Title	Issue Date
7391319	Wireless fire alarm door unlocking interface A wireless fire alarm door unlocking system includes a remote alarm panel interface to receive information from a central alarm panel interface over an RF channel. The central alarm panel interface monitors an output from an alarm control panel and, when an alarm co...	06/24/2008
7158045	Method and apparatus for maintaining an ideal frequency ratio between numerically-controlled frequency sources A method and apparatus for maintaining an ideal frequency ratio between numerically-controlled frequency sources provides a mechanism for maintaining coherence between multiple synchronization references where a known ideal rational relationship between the sources ...	01/02/2007
7154393	Object detection sensor An object detection sensor wherein a detection electrode (electrode connected with a detection circuit via a conductor) is not exposed from a surface and an input signal is scarcely reduced when a contact area is small, which is capable of reliably detecting a conta...	12/26/2006
6668216	Method, apparatus and system for wireless data collection and communication for interconnected mobile systems, such as for railways A system and method for automated, wireless short-range data collection and communications for interconnected mobile systems, such as trains includes a master control unit and a plurality of data transmission units communicating in a daisy-chain fashion a...	12/23/2003
6316758	Adaptive microwave oven The present invention provides an adaptive microwave oven capable of entering an operation mode which avoids interference with a communication device either upon detection of a communication from a communication device (e.g., a cordless telephone) operati...	11/13/2001
6252504	Alarm system using local data channel The alarm system has an alarm unit for ready access at a point of entryway which communicates with a line seize module located in a secure location. The alarm unit has a transmitter receiver, a control panel function, a key pad, and an input/output port f...	06/26/2001
5777547	Car identification and ordering system A car identification and ordering system for trains which identifies each car in the train, the order of those cars, the total number of cars in the train, and the identification of the last car in the train. The car identification and ordering system may...	07/07/1998
5627604	Stabilizing the lock up of a bi-phase stable FPLL by augmenting a recovered DC pilot A bi-phase stable FPLL is locked by a DC pilot component in a recovered data signal. The signal is formatted in repetitive data segments including sync characters and a DC pilot. A sign bit, indicative of the polarity of the recovered data, is developed f...	05/06/1997
5223816	Security and communication system with location detection An improved security and communication system accurately and quickly locates the position of a signaling portable radio frequency transmitter. When a portable transmitter is activated, a first signal, including identification information, is emitted. The ...	06/29/1993
5103206	Security system A security system including a plurality of alarm equipped security units usable at discrete locations and operated by individual power sources at those discrete locations. The units are interconnected and alarm linked with one another with the system bein...	04/07/1992
4885568	Integrated alarm transponder A time multiplexed integrated alarm contact for reporting detected alarm conditions to a system controller in a hardwired alarm system and wherein distinguishable binary frequencies are used for synchronizing/responding and for programming the contact. Du...	12/05/1989
4812820	Electronic surveillance system and transceiver unit therefor A transceiver unit for an electronic surveillance system is internally coded with an address-number for identification within the system and is adapted to receive input from sensors detecting alarm conditions. The unit is switchable from an idle condition...	03/14/1989
4737771	Security system with interference detection A security system having one or more sending units for transmitting an electromagnetic signal representative of a condition such as fire, smoke, intrusion, battery condition, an emergency or other condition to a central receiving unit. Upon reception of a...	04/12/1988
4733223	Apparatus for monitoring a communications system Apparatus for monitoring the status of and controlling faults at remotely-located components in a single line communications system wherein return data signals from the components are transmitted in the 50 kHz to 200 kHz range, and coupled to the low pass...	03/22/1988
4692742	Security system with correlated signalling to selected satellite stations A security system wherein a plurality of locations are monitored by sensors which transmit alarm signals to a central control station by radio or telephone, each alarm signal being encoded to identify the particular sensor location and alarm condition. Th...	09/08/1987
4689602	Railway car order selecting system A railway car order selecting system in which data representing the positional order of the various cars of a train and other data is accurately communicated to a central station regardless of the particular arrangement of the cars. A selecting relay appl...	08/25/1987
4623876	Alarm system to transmit detection information detected by a detector due to a radio system When a transmitter receives an abnormal detection signal from a leaked gas alarm or the like, the transmitter starts the transmitting operation and repeatedly transmits the detection information together with the address information by a radio wave for a ...	11/18/1986
4611198	Security and communication system A security and communication system permits the location of signaling portable radio frequency transmitters which may be carried by individuals. If an individual signals with his portable frequency transmitter, a first signal is sent including a first ind...	09/09/1986
4575712	Communication system A communication system includes a common receiver unit and a plurality of satellite transmitter units remote from the receiver unit. Each transmitter unit has a logic section and a transmitter section, and each transmitter unit is switchable between a sta...	03/11/1986
4550311	Remote sensing systems A security installation at one Site has remote sensors which detect intrusion, fire, etc. and transmit corresponding signals by radio to a master station. Similar installations are provided at other Sites. The sensors of each Site precede their data signa...	10/29/1985
4367458	Supervised wireless security system An ultrasonic communication system capable of wireless installation and supervised operation is achieved by communicating each information bit as two distinct ultrasonic frequencies separated in frequency enough to assure that the signal strength of both ...	01/04/1983
4347501	Installation for transmitting alarm signals In an installation for transmitting alarms, preferably in connection with attacks on persons, and for locating the alarm sender, there is at least one portable alarm sender 2 sending an alarm to a central alarm receiver (3) by radio. The senders each cont...	08/31/1982
4200865	Printed circuit board capable of being inserted and withdrawn on on-line status A printed circuit board loaded with an electronic circuit and constructed to be capable of being inserted in and withdrawn from a bus line on on-line status, in which the input to or the output from the printed circuit board is locked out in response to t...	04/29/1980

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Class 340/536 - Noninterfering