Transponders

Details Transponders Transponders

1976-04-29

1979-07-10

Pitts, Harold I.

Communications: electrical

Digital comparator systems

343 65SS, 340505, H04Q 900, G01S 956

Patent

active

041609719

ABSTRACT:
A passive transponder, particularly for dental or medical applications, is described in which signals received by one or more receive resonant circuits are changed in frequency either up or down by a non-linear device coupled to one or more transmit resonant circuits. Each transmit resonant circuit includes a transducer whose impedance depends on a quantity whose value is to be transmitted and thus the frequency of signals received from the transponder depends on the value of the quantity.

REFERENCES:
patent: 3036295 (1962-05-01), Kleist
patent: 3137847 (1964-06-01), Kleist
patent: 3182314 (1965-05-01), Kleist
patent: 3182315 (1965-05-01), Sweeney
patent: 3218638 (1965-11-01), Honig
patent: 3299424 (1967-01-01), Vinding
patent: 3363246 (1968-01-01), Gareis
patent: 3467962 (1969-09-01), La Plume
patent: 3518546 (1970-06-01), Augenblick
patent: 3522602 (1970-08-01), Ver Planck
patent: 3737911 (1973-06-01), Sakaguri
patent: 3739279 (1973-06-01), Hollis

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