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Class Information
Number: 342/44
Name: Communications: directive radio wave systems and devices (e.g., radar, radio navigation) > Radar transponder system > Unique identity
Description: Subject matter wherein the coded radar retransmitted (reply) signal contains information used to distinguish the transponder station from all others.

Patents under this class:
1 2 3 4 5 6 7 8 9

Patent Number Title Of Patent Date Issued
6184841 Antenna array in an RFID system Feb. 6, 2001
6177872 Distributed impedance matching circuit for high reflection coefficient load Jan. 23, 2001
6177859 Radio frequency communication apparatus and methods of forming a radio frequency communication apparatus Jan. 23, 2001
6150921 Article tracking system Nov. 21, 2000
6147621 Access control system for controlling the access to at least one space, and product including an access control system Nov. 14, 2000
6130602 Radio frequency data communications device Oct. 10, 2000
6127938 Adjustable shield for vehicle mounted toll collection identifier Oct. 3, 2000
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 Aug. 29, 2000
6104278 Universal anti-theft device and method for producing it Aug. 15, 2000
6104337 Distance indicator system for golf Aug. 15, 2000
6104290 Contactless identification and communication system and method of operating the same Aug. 15, 2000
6100840 Radio frequency tag system Aug. 8, 2000
6100804 Radio frequency identification system Aug. 8, 2000
6097292 Contactless proximity automated data collection system and method Aug. 1, 2000
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 Jul. 18, 2000
6081222 Joint surveillance target attack system combat transponder Jun. 27, 2000
6072408 Simulating the presence of a large motor vehicle in an inductive loop of a vehicular traffic signal light control system Jun. 6, 2000
6067039 Systems and methods for determining the distance between two locations May. 23, 2000
6064298 Antitheft system for a motor vehicle May. 16, 2000
6057779 Method of controlling access to a movable container and to a compartment of a vehicle, and a secure cargo transportation system May. 2, 2000
6057765 Non-linear junction detector May. 2, 2000
6054925 High impedance transponder with improved backscatter modulator for electronic identification system Apr. 25, 2000
6052065 Vin reading and transmitting system Apr. 18, 2000
6046683 Modulated backscatter location system Apr. 4, 2000
6034625 Radio-communication vehicle identification system Mar. 7, 2000
6011488 Radio frequency interface device for a transponder Jan. 4, 2000
5955949 Layered structure for a transponder tag Sep. 21, 1999
5933096 Non-stop automatic toll collection system Aug. 3, 1999
5929801 Method for repeating interrogations until failing to receive unintelligible responses to identify plurality of transponders by an interrogator Jul. 27, 1999
5929780 Method of monitoring and programming a plurality of transponders simultaneously, and apparatus for implementing the method Jul. 27, 1999
5917423 Vehicles tracking transponder system and transponding method Jun. 29, 1999
5910776 Method and apparatus for identifying locating or monitoring equipment or other objects Jun. 8, 1999
5905444 Anti-theft system for a motor vehicle May. 18, 1999
5895436 Vehicle tracking system using cellular network Apr. 20, 1999
5891240 Radio frequency automatic identification system Apr. 6, 1999
5883592 Method and apparatus for remotely identifying an electronically coded article Mar. 16, 1999
5872520 Identification and/or sensor system Feb. 16, 1999
5864302 Transmitting and receiving system Jan. 26, 1999
5861817 System for, and method of, displaying prices on tags in supermarkets Jan. 19, 1999
5856788 Method and apparatus for radiofrequency identification tags Jan. 5, 1999
5841364 Method and apparatus for transfering information from a transponder Nov. 24, 1998
5838236 Manufacturing method and apparatus Nov. 17, 1998
5838235 Station, a passive portable object and apparatus for the remote exchange of information between the passive portable object and the station Nov. 17, 1998
5822714 Data processing system and method for accessing a plurality of radio frequency identification tags Oct. 13, 1998
5793630 High precision spatially defined data transfer system Aug. 11, 1998
5792337 Method and apparatus for detection of corrosion Aug. 11, 1998
5793324 Transponder signal collision avoidance system Aug. 11, 1998
5790014 Charging a transponder in a security system Aug. 4, 1998
5790052 Method for determining the position of a vehicle on a road Aug. 4, 1998
5787174 Remote identification of integrated circuit Jul. 28, 1998

1 2 3 4 5 6 7 8 9

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