Device for detecting the presence of a transponder around...

Details Device for detecting the presence of a transponder around... Device for detecting the presence of a transponder around...

2006-01-03

2006-01-03

Mullen, Jr., Thomas J. (Department: 2632)

Communications: electrical

Condition responsive indicating system

Specific condition

C340S572200, C340S572400

Reexamination Certificate

active

06982645

ABSTRACT:
A device for detecting the presence of a transponder in its vicinity is provided, which comprises an antenna, a pulse generation unit, a unit adapted to feed the antenna with the pulses and a unit for measuring the damped oscillations of the antenna as a consequence of being fed with the pulses, the unit for measuring the damped oscillations of the antenna determining whether a transponder is present or not in the vicinity of the antenna on the basis of the characteristics of the damped oscillations.

REFERENCES:
patent: 3836842 (1974-09-01), Zimmermann et al.
patent: 4512000 (1985-04-01), Masuko
patent: 5083113 (1992-01-01), Slawinski et al.
patent: 5661470 (1997-08-01), Karr
patent: 5790031 (1998-08-01), Shelton et al.
patent: 6693512 (2004-02-01), Frecska et al.

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