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US 4,365,169 AGranted
Random pulse detector system
OwnerAllen H. Westoninventor
Life of this patent
Estimating the term…
Abstract
Random voltage spike incident to any appliance load change in electrical supply circuit is sensed by a triac used to close a time limited holding circuit for an electric light circuit to provide random on/off lights "at home" indication for unoccupied premises.
Claims11
A system for automatically switching a light circuit on for limited periods at random times comprising, electrical means for insertion anywhere in a current supply circuit, said electrical means having voltage pulse sensing triac means for energizing said light circuit, and time limited triac energizing circuit means for maintaining said triac means and light circuit on.
Dependencies are inferred from the claim text.