| Patents for G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation (25,929) |
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| 06/29/1976 | US3967261 Proximity sensor with simultaneously active intermixed sensor types |
| 06/29/1976 | US3967190 Method using induced polarization for ore discrimination in disseminated earth deposits |
| 06/22/1976 | US3965413 Determination of the polarity of remanent magnetization of an earth formation penetrated by a bore hole using a highly accurate magnetometer followed by processing of resulting as well as associated data |
| 06/22/1976 | US3965412 Determination of the polarity of remanent magnetization of an earth formation penetrated by a bore hole using an accurate magnetometer |
| 06/15/1976 | US3964042 Static magnetic field metal detector |
| 06/15/1976 | US3962946 Magnetic induction stringed instrument pickup |
| 06/08/1976 | US3962627 Electronic apparatus for testing moving coins employing successive time significant sensings of the effects of proximity of a coin under test to inductive impedance elements upon the effective impedances thereof |
| 06/01/1976 | US3961322 Real time signal discrimination circuitry |
| 06/01/1976 | US3961245 Magnetic locator having improved sensors |
| 06/01/1976 | US3961238 Selective metal detector circuit having dual tuned resonant circuits |
| 05/25/1976 | US3959721 Method employing D.C. pulses for the detection of disseminated or massive mineralization within the earth crust by producing an A.C. electromagnetic field |
| 05/11/1976 | US3956693 Method and apparatus for testing magnetic sensors using a saturable core and variable load resistors to simulate actual test conditions |
| 05/11/1976 | US3956692 Metal object comparator utilizing a ramp having a V-shaped slot for mounting the object accurately within the test coil |
| 04/27/1976 | US3953822 Wave-energy imaging technique |
| 04/13/1976 | US3950696 Trapezoidal coil configuration for metal detector in the shape of an inverted u |
| 04/13/1976 | US3950695 Geophysical prospecting method utilizing correlation of received waveforms with stored reference waveforms |
| 04/06/1976 | US3949293 Apparatus and method for detecting a moving metal mass including means to discriminate signals having a particular period |
| 03/30/1976 | US3947832 System for protecting persons underground from dangerous areas |
| 03/30/1976 | US3947756 Device for geophysical prospecting of ore deposits |
| 03/23/1976 | US3946354 Underwater electrical potential detection system |
| 03/16/1976 | US3944910 Method and apparatus utilizing microwave electromagnetic energy for investigating earth formations |
| 03/09/1976 | US3943436 Line integral method of magneto-electric exploration |
| 03/09/1976 | US3943339 Inductive loop detector system |
| 03/02/1976 | US3942108 Digital test instrument |
| 03/02/1976 | US3942105 Non-contact inductive pickup for determining the interface between two media |
| 02/24/1976 | US3940732 Buoyant electrode and system for high speed towing |
| 02/24/1976 | US3940690 Multi-probe flux leakage testing apparatus using skewed probes |
| 02/03/1976 | US3936728 Method and means for investigating the distribution of electrical conductivity in the ground |
| 01/27/1976 | US3935542 Contactless oscillator-type proximity sensor with constant-voltage impedance |