On-guard Pool Products, LLC

Caretaker System, Inc.

Beamerline, L.l.c.

Thomas E Berk

M Shaun Farrier

Lester R Mathews

Lester R Matthews

A perimeter monitoring system is arranged to detect passage across a perimeter of an area. The system primarily includes an emitter, a retroreflector, a detector and an alarm. The emitter provides a modulated visible laser beam. The retroreflector is arranged to direct the beam along a segment of the perimeter and return the beam along the segment. The detector includes a device that blocks reception of light outside an angle of less than 5 degrees. One or more local or remote alarms are activated in response to the signal. For example, a remote alarm is located on the inside of a residence window where it is activated by another visible laser beam. Alignment of the peripheral monitoring system is less costly and false alarms are less likely than with known systems.

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Scottsdale, AZ, United States of America

Thomas E Berk