Abstract: A detectable component has a first inductive coupler (L;M) adapted to couple inductively to a second inductive coupler (L1) of a detection apparatus when the detectable component is in range of or coupled to the detection apparatus. The first inductive coupler has a resistive component (M) with a resistance that varies with magnetic field to cause modulation of a carrier signal supplied to the second inductive coupler of the detection apparatus, the detectable component having a characteristic signature that enables the detectable component to be distinguished by the detection apparatus from other such detectable components having different characteristic signatures.
Type:
Grant
Filed:
June 9, 2004
Date of Patent:
December 30, 2008
Assignee:
Brewster Kaleidoscope LLC
Inventors:
Colin Philip Brooks, David Bernard Mapleston, Peter Robert Symons, Andrew David White