Method for alerting physical approach

Communications: electrical – Condition responsive indicating system – Specific condition

Reexamination Certificate

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Details

C340S562000, C324S457000, C361S179000

Reexamination Certificate

active

08009045

ABSTRACT:
A method and apparatus is described to detect the physical approach. The method is useful for passively detecting the presence of people, pets, or robots in proximity to a sensor. It is portable, and functions while being carried or placed inside objects.

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