System for locating a plurality of objects

Details System for locating a plurality of objects System for locating a plurality of objects

2006-06-26

2010-02-23

Wu, Daniel (Department: 2612)

Communications: electrical

Condition responsive indicating system

With particular coupling link

C340S539320, C340S539130, C340S573100

Reexamination Certificate

active

07667590

ABSTRACT:
An object locating system includes a primary portable controller including controls and LEDs, a transceiver, a digital signal processor, and a memory. The memory includes programmable software instructions that cause the primary controller to emit search signals that have corresponding unique frequencies. A phase-locked loop frequency synthesizer circuit is coupled to the signal processor for comparing a feedback frequency of the search signals. Secondary controllers are removably attached to the objects. Each secondary controller includes a transceiver that has an antenna coupled thereto, a processor, and a memory including software instructions that cause the secondary controller to transmit a location signal upon verifying the identity of the corresponding search signal. The primary and each secondary controller memories are EEPROMs. A transducer is coupled to the processor and emits an audible and visual signal in response to receiving the search signal.

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