Location of objects

Details Location of objects Location of objects

1990-07-09

1993-05-25

Ng, Jin F.

Communications: electrical

Condition responsive indicating system

Specific condition

340505, G08B 1314

Patent

active

052144100

ABSTRACT:
A locating system 10 for locating predetermined labelled objects 20 includes a transceiver unit 12 which comprises a narrow beamwidth antenna 14 for transmitting an energizing signal 16 at a predetermined first frequency and for receiving a returned signal 22 at a predetermined second frequency from an object to be located, the energizing signal 16 incorporating a predetermined transponder category code. A plurality of label-like transponders 18 is provided, each of which is affixable to an object 20 to be located. Each transponder 18 includes logic circuitry in order that each transponder 18 in a predetermined group of labelled objects 20 constituting the category radiates a returned signal 22, including a transponder identification code, to the transceiver unit 12 in a time-delayed manner so that returned signals 22 are received serially by the transceiver unit 12.

REFERENCES:
patent: 3806905 (1974-04-01), Strenglein
patent: 4249167 (1981-02-01), Purinton et al.
patent: 4384289 (1983-05-01), Stillwell et al.
patent: 4593273 (1986-06-01), Narcisse
patent: 4612534 (1986-09-01), Buehler et al.
patent: 4837568 (1989-06-01), Snaper
patent: 4918425 (1990-04-01), Greenberg et al.
"Invention to the Rescue", Information News, Winter 1987.

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