Freshpatents: Resonant pulse induction metal detector

[msysta]

Abstract: A metal detector transmitting high current pulses and employing the high voltage back EMF signals which occur at their termination. The method employed uses a resonant tuned receive coil which provides a major improvement in the depth of detection of metallic objects and interference rejection over current time and frequency domain metal detectors. (end of abstract)

http://www.freshpatents.com/-dt20090219ptan20090045813.php

[WM6]

Abstract: A metal detector transmitting high current pulses and employing the high voltage back EMF signals which occur at their termination. The method employed uses a resonant tuned receive coil which provides a major improvement in the depth of detection of metallic objects and interference rejection over current time and frequency domain metal detectors. (end of abstract)

Not so fresh. Already published here. It is about controversal many years developed Pulse Devil of NC Dave.

http://www.geotech1.com/forums/showpost.php?p=41961&postcount=1

[mikebg]

There is also a thread
"Just curious, is this the Pulse Devil patent?"
started by FrankMD on Sept. 13, 2009 in the forum of Eric Foster.