The following are patents on mine detectors.

Download Patent # Title Description
PDF 1198K US5307272 Minefiled Reconnaissance and Detector System Pulsed radar
PDF 955K US5680048 Mine Detecting Device Having a Housing Containing Metal Detector Coils and an Antenna Appears to combine a metal detector and GPR in one search head.
PDF 936K US7532127 Motion and Position Measuring for Buried Object Detection Mine detector
PDF 1209K WO09808115 Surface Penetrating Object Detection System GPR + metal detector