Distance determination and alarm system

Communications: electrical – Condition responsive indicating system – With particular coupling link

Reexamination Certificate

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Details

C340S539100, C340S539150, C340S539210, C340S870030, C340S573300, C340S573400

Reexamination Certificate

active

07623030

ABSTRACT:
A distance determination and alarm system for alarming when a wireless transmitter is either close or distant, having a wireless transmitter for transmitting an emitter signal. A wireless receiver is for receiving the emitter signal. The wireless receiver is for resolving the distance between the wireless transmitter and the wireless receiver. A proximity switch is electrically connected to the wireless receiver for selectable switching between within boundary alarm and out of boundary alarm. An alarm is electrically connected to the wireless receiver.

REFERENCES:
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patent: D339757 (1993-09-01), Feeney
patent: 5576692 (1996-11-01), Thompkins et al.
patent: 5589821 (1996-12-01), Sallen et al.
patent: 5892447 (1999-04-01), Wilkinson
patent: 6198930 (2001-03-01), Schipper
patent: 6366202 (2002-04-01), Rosenthal
patent: 6486777 (2002-11-01), Clark
patent: 2002/0097152 (2002-07-01), Mengrone et al.
patent: 2003/0011478 (2003-01-01), Rabanne et al.
patent: 2004/0119594 (2004-06-01), Sanchez et al.

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