An improved interrogator for an inductively coupled iden tification system is disclosed. The
interrogator provides a multidimensional electromagnetic field through a plurality of coils …

A transducer and interrogator device is disclosed in which the interrogator provides power
and information to the transducer via a magnetic field. The transducer is a passive actuator …

Provision is made for identifying tools used in an automated machine tool system. A module
or transponder is mounted to the tool and interrogated by a transceiver which, in the …

57 ABSTRACT A computerized transceiver repeatedly sweeps through a set of
transmit/receive frequencies to interrogate col lectively a plurality of groups of items in a …

A compact rf reader apparatus integrated into a single compact package structure. In one
embodiment, a rotatably adjustable head is mounted on the compact reader body portion …

The present invention is summarized in that a phase encoded transponder circuit includes a
previously loaded set of data words which includes an individual unique identification code …

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 …

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 …

An automatic information transmission system for a mobile object, the system including a
response unit arranged to be carried along with the mobile object, and an interrogation unit …

Transponder identification record assembly is suitable for associating an identification code
with a code recipient and for maintaining an independent record of the identification code …