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https://drivepatents.com/patents/959098 · 22 Jul 2015
The invention states to a complex proximity, detection system. The invention provides a proximity detection system comprising a generator (22, 44, 46) that generates a magnetic field that establishes a boundary, where the generator is capable of receiving ...
https://drivepatents.com/patents/989488 · 26 Jun 2013
A proximity detection comprising a generator that generates a magnetic field that establishes a boundary, where the generator is capable of receiving radio frequency signals. Also provided is a radio frequency device that sends radio frequency signals, the...