Station, a passive portable object and apparatus for the remote

Communications: electrical – Condition responsive indicating system – Specific condition

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Details

34082554, 235449, 235451, 342 44, G08B 1314

Patent

active

058382356

ABSTRACT:
Apparatus for the exchange of information by electromagnetic coupling between a passive portable object and a station comprising: first electromagnetic coupling means for the transmission of data between the portable object and the station, and second electromagnetic coupling means independent of the first means for the transfer of energy and a clock signal to the portable object. A filtering circuit is provided on the station side, which behaves as an inductance at the frequency associated with the data transmission and as a high value impedance at the frequency associated with the energy transfer.

REFERENCES:
patent: 3689885 (1972-09-01), Kaplan et al.
patent: 3914762 (1975-10-01), Klensch
patent: 4658263 (1987-04-01), Urbanski
patent: 4818885 (1989-04-01), Mongeon et al.
patent: 4924171 (1990-05-01), Baba et al.
patent: 5028918 (1991-07-01), Giles et al.
patent: 5491468 (1996-02-01), Everett et al.

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