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6219613 Vehicle position determination system and method  
A vehicle position determination system for determining the position of a moving vehicle having a transponder includes a first and second antennas operable to receive periodic radio frequency data...
6215437 Procedure for reading the data stored in a transponder and a transponder system for the execution of the procedure  
For reading the data stored in a transponder by means of an interrogation device, the interrogation device at first receives the background noise for the purpose of detecting interference...
6181198 Amplitude and phase demodulation circuit for signals with very low modulation index  
An amplitude and phase demodulator circuit for signals with very low modulation index, including: amplifier circuitry adapted to amplify a modulated signal coming from a transmitter, the modulated...
6177859 Radio frequency communication apparatus and methods of forming a radio frequency communication apparatus  
A method of forming a radio frequency communication apparatus includes providing a substrate provided with an outermost surface. An RFID is adhered at least partially within the substrate, and the...
6167236 Damping modulation circuit for a full-duplex transponder  
An improved damping modulation circuit (140) for a transponder (14) receives energy transmitted from a transmitter/receiver antenna (16) to produce a unique recognition signal in the transponder....
6161276 Method for producing a transponder coil  
A method of producing a transponder (20) comprising the following steps: demarcating the various turns (8) of a coil in a sheet (1), including a dielectric substrate covered by at least one...
6109526 Optical and passive electromagnetic reader for reading machine-readable symbols, such as bar codes, and reading wireless tags, such as radio frequency tags, and corresponding method  
A document or object includes resonant tags, such as thin dipoles, and a machine-readable symbol, such as an area symbol, secured thereto. A reader reads the symbol and determines response...
6104337 Distance indicator system for golf  
A golf distance indicator system provides measurement and display of the distance between a golfer and the pin on the green he is approaching. The system comprises a portable unit carried by the...
6104278 Universal anti-theft device and method for producing it  
The present invention relates to a universal anti-theft device for securing articles against theft, which has at least one electromagnetic resonant oscillating circuit (2) that, in the...
6100804 Radio frequency identification system  
A radio frequency identification system employing a thin, flexible electronic radio frequency identification (RFID) tag having an overall thickness not exceeding approximately 280 microns and the...
6100840 Radio frequency tag system  
The RF tag system of the present invention minimizes the effect of the RF tag on the overall radar cross section (RCS) of the object with which it is associated, tailors the signal reflected from...
6097293 Passive electrical marker for underground use and method of making thereof  
A passive electrical marker has tuned circuits, each of which includes a coil and a capacitance. The tuned circuits are oriented with respect to each other in a predetermined arrangement so as to...
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...
6084530 Modulated backscatter sensor system  
A radio communication system includes an Interrogator for generating and transmitting a radio signal. One or more Tags contained within the radio communication system receive the radio signal. A...
6072383 RFID tag having parallel resonant circuit for magnetically decoupling tag from its environment  
An RFID tag circuit provides magnetic decoupling and amplitude modulation. The circuit is made up of a first inductor and a second inductor connected in series, a first capacitor, a second...
6064320 Automatic vehicle identification system capable of vehicle lane discrimination  
A system of vehicle identification with a first interrogator that uses a Lower SideBand (LSB) receiver to receive a modulated signal from a vehicle transponder and a second interrogator that uses...
6054925 High impedance transponder with improved backscatter modulator for electronic identification system  
A transponder 20 for an electronic identification system transponder is characterized in that it presents a high input impedance (>400Ω) at an input thereof which is directly connected to an...
6052065 Vin reading and transmitting system  
A new VIN Reading and Transmitting System for providing a device for automatically detecting a vehicle identification number and transmitting the number to a dispatch station for immediate...
6050225 Radio controlled release apparatus for animal data acquisition devices  
A novel apparatus for reliably and selectively releasing a data acquisition package from an animal for recovery. The data package comprises two parts: 1) an animal data acquisition device and 2) a...
6049292 Method for the transmission of information and base station for receiving of information  
Contactless transmission of information from a passive transponder to a base station takes place in known manner by load modulation in the transponder. The coils of resonant circuits in the base...
6046683 Modulated backscatter location system  
A radio communications system is that can determine the location of an RFID Tag. The radio communication system includes at least one Interrogator for generating and transmitting a modulated radio...
6031459 Wireless communication devices, radio frequency identification devices, and methods of forming wireless communication devices and radio frequency identification devices  
The present invention provides wireless communication devices, radio frequency identification devices, and methods of forming wireless communication devices and radio frequency identification...
5970148 Low cost encryption transponder  
Novel means of achieving increased security while still obtaining a low cost, manufacturable device are disclosed and claimed. The first mode of operation is the learn mode which provides means...
5966082 Method of flagging partial write in RF tags  
A method, system, and apparatus for sending data from a base station to an RF tag, whereby the RF tag comprises an "intention to write to memory" field, and the "intention to write to memory"...
5955949 Layered structure for a transponder tag  
A transponder antenna is carried by a substrate and is sandwiched between the substrate and a cover sheet. A rectangular opening extends through the cover sheet and receives a signal processing...
5945938 RF identification transponder  
An RF identification transponder comprises a substrate layer, and an array of M*N antenna elements formed on the substrate layer, where M and N are integers. The antenna elements have a common...
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...
5929801 Method for repeating interrogations until failing to receive unintelligible responses to identify plurality of transponders by an interrogator  
A novel addressing scheme for an RF-ID system or LAN network is presented in which an interrogator(reader) addresses a set of transponders, each transponder in this set having a common addressing...
5929780 Method of monitoring and programming a plurality of transponders simultaneously, and apparatus for implementing the method  
A method and apparatus for simultaneously storing a set of read/write or respond-to-order transponders located in a container. The method transmits radiation to read/write trnsponders to energize...
5889489 Diode receiver for radio frequency transponder  
A passive radio frequency transponder (RF tag) having a diode rectifier receiver circuit outside the tag power rectification circuit, the tag power rectification circuit supplying power to the...
5872520 Identification and/or sensor system  
An identification and/or sensor system includes a sensor that queries an identification and/or sensor configuration which contains resonators. A receiver receives an answer signal from the...
5866024 Probe card identification for computer aided manufacturing  
A system for identifying probe cards including a prober which accepts a number of interchangeable probe cards, each carrying a transponder tag; a magnetic coupling antenna supported above the...
5867100 Air Coil a security badge and a transponder  
In one aspect, the present invention provides an air coil 20. The air coil 20 may be made from a strip of electrically conductive material 22 which has an insulating material overlying it. For...
5864302 Transmitting and receiving system  
A transmitting and receiving system including, a transponder always maintains a transmission function even if circuit constants of circuit elements are deviated or such circuit constants are...
5862222 System at a vehicle for debiting at automatic fuelling  
System for automatic fuelling of a vehicle and debiting for fuel obtained. A transponder is provide on the vehicle for the positioning of a fuelling robot and includes coded information to be...
5862456 Vehicle device for data transmission to a stationary beacon, and resultant communication system  
A device of a vehicle for data transmission to a stationary beacon 91), which has a transceiver, comprising an on-board unit (2) with an antenna (6) for receiving a continuous signal (5),...
5856788 Method and apparatus for radiofrequency identification tags  
A method and apparatus for determining the identification number or any other information within a plurality of radiofrequency identification tags within a common field of interrogation utilizes a...
5841214 Identification mark operating with acoustic surface waves  
An identification mark operating with acoustical surface waves includes at least one reflector having higher reflectivity than a reflectivity of other reflectors.
5841364 Method and apparatus for transfering information from a transponder  
A transponder unit (10) includes an N cycle counter (30) and an M cycle counter (28). The N cycle counter (30) has a different cycle value than the M cycle counter (28). During the transmission of...
5825329 Modulated backscatter microstrip patch antenna  
The invention provides a microstrip patch antenna for emitting backscatter-modulated signals in response to a received signal. The antenna has two segments that are connected together by a switch....
5818382 Long range RF tag  
A long range identification system is disclosed for utilizing a radio frequency (RF) signal sent by a calling location, such as a mass transit vehicle, as the energy source to power response...
5809142 Method and system for calculating a user account balance in a recognition system  
A system and method in which a transponder (14) is operable to transmit an original user account balance to an interrogator (12), which in turn calculates a revised user account balance and...
5793324 Transponder signal collision avoidance system  
Transponder signal collision avoidance system incudes a reader and wireless HDX or FDX type transponders (A, B) are disclosed, interrogated by the reader (R) by alternately powering and then...
5792337 Method and apparatus for detection of corrosion  
A method and apparatus for sensing corrosion are provided in which an interrogation unit (14) transmits interrogation pulses and receives responses. A plurality of corrosion sensors (12) are...
5786910 Pattern metallized optical varying security devices  
Security devices which are difficult to reproduce include a grid screen metallization pattern. The grid screen metallization pattern may be laid down over a hologram or diffraction grating formed...
5784686 IQ combiner technology in modulated backscatter system  
In accordance with the present invention, an RFID system has a homodyne receiver having two outputs; the in-phase or I output and the quadrature or Q output. The modulated backscattered signal is...
5781106 Device and method for the telecontrol of an object  
A vehicle (V) is fitted with a primary receiver/emitter cell (1) containing a first code (C1) and a secondary receiver/emitter cell (2) containing a second code (C2) as well as a first...
5771021 Transponder employing modulated backscatter microstrip double patch antenna  
A reader interrogates a transponder attached to a remote object. The transponder includes a microstrip patch antenna having two segments connected together by a switch, each segment being one-half...
5764138 RF identification system for providing static data and one bit of variable data representative of an external stimulus  
An RF identification system for generating data indicative of an item that is tagged, and one bit of variable data representative of an external stimulus. An ID code reader is provided and an RF...
5751570 Method of automatically identifying an unknown number of transponders with a reader and identification system for executing the method  
In a method for automatically identifying an unknown number of transponders, these transponders are put into a dead state by a collision signal transmitted by the reader. Then, each transponder...