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| Number | Title | Issue Date |
| 4129855 | Animal identification system A transceiver unit includes an oscillator which generates a pulse train to a transceiver counter that connects to a display. The pulse train is also coupled by means of coils to a counter contained in a portable transponder unit which attaches to the anim... | 12/12/1978 |
| 4123754 | Electronic detection and identification system An electronic detection and identification system for use in the rapid identification of vehicles at a toll stop, and like uses, is provided which employs an electronic identification card that is carried by the vehicle to be identified and a fixed transm... | 10/31/1978 |
| 4121102 | Object identification system A transponder/interrogator system for remotely identifying objects. The interrogator emits infrared pulses to activate and remotely clock the transponder. Upon such activation, the transponder emits a unique code in the form of infrared pulses in accordan... | 10/17/1978 |
| 4121208 | Device for increasing the safety with respect to transmission faults in an information transmission system A device for increasing security with respect to transmission faults in an information transmission system, particularly for the railroad field, in which an interrogation device and a passive response device are movable relative to one another, and the in... | 10/17/1978 |
| 4117481 | Sidelooking radar and system for identifying objects A radar which can be used in a system for identifying coded objects. A passive encoding array (label) for an object and having dipoles at selected dipole locations in the array, and a radar for scanning the array as it crosses the radar beam. The radar ut... | 09/26/1978 |
| 4114151 | Passive transponder apparatus for use in an interrogator-responder system A passive transponder for use in an interrogator-responder communication system is disclosed, including a first signal receiving element having a variable reflection property, a code signal generator for supplying a code signal, a modulating device respon... | 09/12/1978 |
| 4104630 | Vehicle identification system, using microwaves A vehicle identification system, using microwave, in which every vehicle to be identified has an identification panel attached to its side, containing a very low level power drain tunnel diode transponder and a digital coder plus a small battery and a res... | 08/01/1978 |
| 4096477 | Identification system using coded passive transponders An identification system including a transmitter, a receiver, a decoding subsystem, and a passive transponder identifier. One passive transponder identifier of the invention is a surface acoustic wave device provided with pad means for applying and removi... | 06/20/1978 |
| 4087791 | Electromagnetically responsive device and system for detecting the same A passive electromagnetically responsive device comprising a miniature tuned inductive-capacitive circuit. The device is preferably detected by stimulating oscillations at the resonant frequency of the circuit by a pulsed electromagnetic field. The device... | 05/02/1978 |
| 4070672 | Answering device for a system for the automatic wireless transmission of multi-position data between interrogation devices and answering devices movable with respect to one another An answering device in a system for automatic wireless transmission of an item of information coded by a plurality of frequencies is disclosed herein. An interrogation device movable with respect to the answering device transmits an interrogation signal h... | 01/24/1978 |
| 4069472 | Foreground subject-identifying apparatus A foreground subject-identifying apparatus comprises a sweep signal generator for issuing a sweep signal having frequencies fs falling within a prescribed range; a carrier wave generator for producing a carrier wave having a frequency f0 | 01/17/1978 |
| 4068211 | Vehicle identification system having error detection means Vehicle identification system comprising a carrier period detector in which, to increase the accuracy of identification signals received, the identification signal is rejected and a new identification signal is requested whenever one period is absent from... | 01/10/1978 |
| 4068232 | Passive encoding microwave transponder A passive transponder which provides remote identification of objects including cargo and trailers, vehicles or a variety of objects which move through an interrogator beam. The passive transponder is mounted onto the vehicle or object or at the location ... | 01/10/1978 |
| 4060805 | Integrated terminal area surveillance system An integrated airport terminal area surveillance system, including a plurality of spaced apart interrogating and receiving stations and central equipment for controlling the stations operates in search and track modes by transmitting interrogation message... | 11/29/1977 |
| 4059831 | Passive transponders using acoustic surface wave devices A passive transponder sensitive to electromagnetic pulses received in the form of surface acoustic waves. The device utilizes a plurality of interdigital transponders each consisting of a metallic deposit on a piezoelectric substrate and serving as an ele... | 11/22/1977 |
| 4040053 | Transponder system for the transfer of signalling information for rail-bounded vehicles A transponder system with ensured synchronization for a railway signalling system, comprising an interrogating station, from which an interrogation signal is transmitted continuously, and a responder station which is energized in response to the interroga... | 08/02/1977 |
| 4025791 | Object identification system A transponder/interrogator system for remotely identifying objects. The interrogator emits infrared pulses to activate and remotely clock the transponder. Upon such activation, the transponder emits in synchronism with the interrogator pulse a unique code... | 05/24/1977 |
| 4015259 | Method and apparatus for interrogating and identifying fixed or moving targets Hijacked vehicles, or the like, are identified by illuminating a transpon mounted to the vehicle by a beam of microwave energy, e.g., from a helicopter flying over the traffic. The transponder includes non-linear diodes which reradiate a signal back towa... | 03/29/1977 |
| 4001822 | Electronic license plate for motor vehicles An electronic license tag or plate formed into a unitary structure and including a single antenna system cooperating in a system comprising a harmonic radiator which transmits a pulse coded identification signal in response to an interrogation signal, and... | 01/04/1977 |
| 3984835 | Homodyne communication system A homodyne communication system comprising an interrogating unit and a plurality of responsive remote units wherein a continuous wave RF signal is transmitted from the interrogating unit to illuminate a remote unit. The remote unit causes a return (reply)... | 10/05/1976 |
| 3981011 | Object identification system using an RF roll-call technique An object identification system using an RF roll-call technique wherein an interrogator illuminates a multitude of cooperating objects with a sequence of codes and receives from each such cooperating object an acknowledge signal immediately following the ... | 09/14/1976 |
| 3964024 | Transponder for an automatic vehicle identification system This disclosure relates to an inductively powered type of electronic transponder for identifying a moving object passing an interrogation area. The transponder includes a tuned inductive-capacitive pick-up circuit for receiving interrogating signals. The ... | 06/15/1976 |
| 3959792 | Device for the facilitation and simplification of the adjustment of resonators of an answering device in a microwave railroad vehicle identification system A device for the facilitation and simplification of the adjustment of resonators of an answering device coupled to a high frequency line, for a microwave transmission system for railroad vehicles or information assigned to certain points with several digi... | 05/25/1976 |
| 3938146 | Secure encoder for trilateralization locator utilizing very narrow acceptance periods A system for radar station identification depends primarily upon the encoding growing out of a pulse repetition rate of interrogation pulses. To secure the encoding, one or more pulses arm the system and succeeding pulses must be detected during an extrem... | 02/10/1976 |
