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6252691 Intrasatellite wireless communication  
A wireless intrasatellite communication system is disclosed. Satellite telemetry signals are multiplexed, converted into a digital data stream, and processed by an ASIC to form a multiplexed...
6236333 Passive remote keyless entry system  
A passive remote keyless entry system includes a plurality of sensors each associated with a door of the vehicle. Each sensor detects the presence and distance of a key fob from the sensor. By...
6222440 Location, identification and telemetry system using strobed signals at predetermined intervals  
A tracking system is implemented according to the invention in which the identification data of a wireless transmitter is divided into multiple bursts. Instead of transmitting the entire...
6218929 Door entry control by wireless communication  
In a vehicular entry control system, a code signal transmitter of a card carried by a driver modulates by a card-specific code a signal received from a transmitter/receiver of a control unit...
6219530 Transponder communication station provided with a transmission coil configuration with three transmission coils  
A communication station (1) for contactless communication with at least one transponder is provided with a transmission coil configuration (2) with an active, first transmission coil circuit (3)...
6208235 Apparatus for magnetically decoupling an RFID tag  
A resonant circuit tag includes an integrated circuit for storing data and an antenna circuit for generating a first local field and resonating at a first predetermined radio frequency. A second...
6198381 Delayed reset mode model for electronic identification systems  
There is disclosed and claimed an electronic identification system including at east one reader and a plurality of transponders to be read by the reader. Each transponder has a normal operational...
6191703 Remote convience system and method with proximity-based disablement RFO preventing inadvertent function activation  
A remote convenience system (10) of a vehicle (12) allows remote control operation of one or more vehicle functions (e.g., lock or unlock of vehicle doors). A portable transmitter (14) of the...
6188310 Natural frequency measurement of magnetic markers  
An electronic article surveillance (EAS) system, comprising: an antenna for capturing signals generated in an interrogation zone, the captured signals including noise and, when at least one marker...
6177861 System for short range wireless data communication to inexpensive endpoints  
A system provides short range wireless data communication from a central control point (e.g., interrogator) to inexpensive endpoints (e.g., tags). The endpoints utilize the technology of modulated...
6097278 Transponder communication device for the contactless communication with a plurality of individually selectable transponders, and transponder for the contactless communication with at least one transponder communication device  
In a transponder communication device (1) having a selector for the successive individual selection of transponders (2) the selector having interrogator (5) for generating at least one item of...
6094147 Method for detecting an electroconductive element in a document  
The invention relates to a method for detecting an electroconductive element in a document, a signal with a modulated carrier frequency being coupled to at least one transmitting electrode. This...
6091342 Transponder communication device for the contactless communication with at least one transponder, and transponder for the contactless communication with at least one transponder communication device  
A transponder communication device has an interrogation signal generator for generating an interrogation signal, a transmitter for transmitting the interrogation signal to a number of...
6091319 Method for resolving signals collisions between multiple RFID transponders in a field  
Communications between an RFID interrogator and an RFID transponder require that no more than one transponder be present in the reading range of the interrogator and transmitting into motion at...
6052062 Cards, communication devices, and methods of forming and encoding visibly perceptible information on the same  
Cards, communication devices, and methods of forming the same and encoding visibly perceptible information on communication devices are provided. A remote intelligent communication device...
6046676 Self powered electronic memory identification tag with dual communication ports  
A tag for use in identifying and communicating with an electronic device such as a computer is disclosed. The tag is self powered from an RF interrogation signal when the electronic device is not...
6043755 Systems and methods employing a plurality of signal amplitudes to record the presence of multiple objects  
A system and method for identifying objects. A preferred embodiment employs a radio transceiver on each object. Each article is identified by recording an amplitude at which the respective...
6034604 Deactivation prevention for electronic article surveillance systems  
A method is disclosed for incorporation into an electronic article surveillance (EAS) detection system, which essentially eliminates the unintended deactivation of deactivatable target labels. The...
6018641 Radio IC card system  
A radio IC card system includes an IC card and a toll collector. When an automobile with the IC card passes by a tollgate, the toll collector installed in the tollgate transmits a first radio...
6014088 Method and system for contactless exchange of data between a read/write unit and one or more information carriers  
A method and system for contactless exchange of information between a read/write unit and at least one information carrier, using wireless radiofrequency signal transmission including an...
5995017 Electronic identification system confirming valid code  
An identification system having an interrogator and a number of transponders. The interrogator includes a transmitter for transmitting an interrogation signal to the transponder, and a receiver...
5973610 System for automated selection of a communications unit for refrigerating containers  
Refrigerating containers (reefers) disposed in a seaboard terminal or onboard a ship and with a power supply via cables is monitored by means of built-in equipment and communicates via the power...
5966083 Electronic indentification system with transponder muting  
An identification system includes an interrogator and a number of transponders. The interrogator includes a transmitter for transmitting an interrogation signal to the transponder, and a receiver...
5952935 Programmable channel search reader  
An interrogator for use with a plurality of identification systems using different frequencies and different methods of demodulation and decoding is provided. Each of the identification systems...
5936540 Process for the management of concurrent access and device for practicing the same  
Process for managing concurrent access permitting the successive input or storage of several slave devices (receiver/transmitter) in the field of action of a master device (emitter/reader) so as...
5926093 Drive circuit for reactive loads  
A highly efficient resonant switching driver circuit includes a matching reactance coupled between an output resonant circuit and a driver circuit. The matching reactance performs a series to...
5923300 Multi-phase transmitter with single receive antenna for transponder interrogator  
An antenna includes a transmitter including a first transmit coil wound in a first direction. A second transmit coil is electrically coupled to the first transmitter and wound in a second...
5866891 Transmitter-receiver for non-contact IC card system  
In a non-contact IC card system which transmits and receives signals between an interrogator and a transponder, a transmitter-receiver used for the interrogator includes a carrier wave oscillator...
5826175 Active tag having one diode for modulation and demodulation  
Known tags which are capable of receiving and demodulating signals by way of one and the same antenna and by way of one and the same diode, as well as being capable of modulating and transmitting...
5818348 Method and radio frequency identification system for a novel protocol for reliable communication  
Reliable communication is provided by a radio frequency identification system comprising at least one of an interrogator (102) and a transponder (104). The interrogator (102) transmits a plurality...
5815818 Cellular mobile communication system wherein service area is reduced in response to control signal contamination  
In order to facilitate communications in a cellular communication system wherein control signal contamination renders communication with the closest cell impossible, the transmission power of the...
5781112 Electronic tagging device for identifying transported products  
A transmitter for use in the food industry for unique identification of a transport device such as a hanger for a carcass or a container for food products is mounted within a housing which...
5765112 Low cost wide area network for data communication using outbound message specifying inbound message time and frequency  
A two-way communications system that provides ubiquitous wireless data communication services, such as throughout the continental United States, by using a network of only a few, widely...
5712630 High power moving object identification system  
A moving object identification system with a novel coding scheme achieves 75% transmission efficiency. With this system, a transmittable range is expanded. Logical value assignment for residual...
5689239 Identification and telemetry system  
The present invention relates to a system for automated identification of articles such as baggage or carrier cargo wherein an electronic sub system called an interrogator including a transmitter...
5648761 Card with inhibit given remote interrogation  
Contact-free cards that have at least two coupling elements spatially separated from one another such as, inductor coils, capacitors plates or photoreceivers, that utilize the effects derived from...
5646607 Transponder/interrogator protocol in a multi-interrogator field  
A method is described with the aid of which messages can be transmitted from batteryless transponders to interrogation devices. The interrogation devices are equipped with a receiving section and...
5604486 RF tagging system with multiple decoding modalities  
An RF tagging system includes an RF tag (10, 30) and an RF tag reader 80. The RF tag includes a plurality of RF resonant circuits. Each RF resonant circuit is resonant at a given RF frequency. A...
5591951 System and method for simultaneously collecting serial number information from numerous identity tags  
A system and method for simultaneously collecting serial number information reports from numerous colliding coded-radio-frequency identity tags. Each tag has a unique multi-digit serial number...
5585789 Data communication apparatus  
A data communication apparatus has a RAM for storing address information concerning a plurality of destinations (e.g., data for telephone directory, name card management, or the like), and the...
5552778 Multibit bimorph magnetic tags using acoustic or magnetic interrogation for identification of an object coupled thereto  
A tag structure suitable for attachment to an object includes one or more bimorphs comprised of a thin strip of a magnetostrictive material attached to a thicker bar of hard magnetic material. The...
5550536 Circuit frequency following technique transponder resonant  
A transponder system (10) includes an interrogation unit (12) that transmits a first frequency F1 representing a binary zero, and a second frequency F2, representing a binary one. These signals...
5500651 System and method for reading multiple RF-ID transponders  
A system and method for communicating between an identification reader 12 and a transponder unit 10 is disclosed herein. A first interrogation signal is transmitted from the reader 12. This first...
5457629 Vehicle data system with common supply of data and power to vehicle devices  
A vehicle for transport, fork lift or delivery route operations, for example, includes on-board peripherals which are coupled through a Local Area Network (LAN) into a data system. A LAN data bus...
5440560 Sleep mode and contention resolution within a common channel medium access method  
A method of sleep mode and contention resolution provides management of a sleep mode in stations and backup for resolution of contention on request for service messages. This reduces the...
5426423 Process and device for registering and checking items  
In particular for reducing the waiting time at the checkouts of self-service supermarkets, articles are registered by providing each article with a microcircuit (24) having a loop for picking up...
5410315 Group-addressable transponder arrangement  
A responder unit (12) located in spaced relation with respect to an interrogator unit (10) is described. The responder unit (12) has a responder unit receiver (130) for receiving at least one RF...
5400018 Method of relaying information relating to the status of a vehicle  
A method for reduces the amount of information relating to the status of a vehicle relayed from the vehicle to a remote location over a communications data link. The method includes the steps of...
5276430 Method and electromagnetic security system for detection of protected objects in a surveillance zone  
The transmitter antenna coils (3,4) provide an oscillatory electromagnetic field in a surveillance zone (1) wherein a security tag of easily saturable magnetic material originates a tag signal....
5159332 Proximity identification system with flux concentration in operating region  
A proximity identification system incorporating ferrite rods. The rods are used in both the reader and the tag and additional rods may be used to strengthen and concentrate the flux field in the...