| 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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| 02/21/1978 | US4075553 Electromagnetic detector responsive to a modification of radiated field by an intruding metallic object |
| 02/14/1978 | US4074249 Magnetic detection means |
| 02/07/1978 | US4072200 Surveying of subterranean magnetic bodies from an adjacent off-vertical borehole |
| 01/31/1978 | US4071815 Well logging system for measuring remanent magnetic fields in the earth |
| 01/24/1978 | US4070612 Method and apparatus for measuring terrain resistivity |
| 01/10/1978 | US4068189 Linear oscillator for proximity sensor |
| 01/10/1978 | US4068164 Harmoic flux gate magnetometers and gradimeters and windings |
| 01/10/1978 | US4067520 Method and apparatus for terrain avoidance |
| 01/03/1978 | US4066962 Metal detecting device with magnetically influenced Hall effect sensor |
| 12/13/1977 | US4063229 Article surveillance |
| 12/13/1977 | US4063161 Buried cable fault locator with earth potential indicator and pulse generator |
| 12/13/1977 | US4063151 Microwave apparatus and method for determination of adsorbed fluid in subsurface formations surrounding a borehole |
| 11/29/1977 | US4060718 Geodetic survey method |
| 11/29/1977 | US4060039 Security system |
| 11/22/1977 | US4059795 Digital eddy current apparatus for sensing and analyzing metallurgical characteristics of an electrically conductive material |
| 11/01/1977 | US4056769 Direct current proximity detector having switching means which provide on two distinct outputs, signals when the target is located beyond or within a predetermined range |
| 10/18/1977 | US4054255 Microwave ice detector |
| 10/11/1977 | US4053828 Metal detector with first and second nested rectangular coils |
| 10/04/1977 | US4052666 Remote sensing of vegetation and soil using microwave ellipsometry |
| 10/04/1977 | US4052662 Method and apparatus for investigating earth formations utilizing microwave electromagnetic energy |
| 09/20/1977 | US4050011 Eddy current flaw detector using a pair of parallel resonant circuits and a negative resistance in parallel with each circuit |
| 09/06/1977 | US4047103 Eddy current position indicating apparatus for measuring displacements of core components of a liquid metal nuclear reactor |
| 09/06/1977 | US4047098 Process and a device for prospecting the ocean bed by measuring electromagnetic fields |
| 08/30/1977 | US4045727 Microwave proximity detector |
| 08/30/1977 | US4045724 Electromagnetic wave method for mapping subterranean earth formations |
| 08/23/1977 | US4044299 Concealed structure locating and surveying translator apparatus |
| 08/23/1977 | US4043800 Oxygen gas |
| 08/16/1977 | US4042876 Eddy current gauge for monitoring displacement using printed circuit coil |
| 08/09/1977 | US4041372 Apparatus for multi-channel induced polarization surveying |
| 08/02/1977 | US4039938 Method and apparatus for detecting faults in buried insulated conductors |
| 07/26/1977 | US4038609 Replica bridge sensing circuit |
| 07/12/1977 | US4035718 Enclosed nuclear-magnetism logging tool with compensated coil-isolating system |
| 06/14/1977 | US4030037 Proximity detecting apparatus |
| 06/14/1977 | US4030028 Method of and apparatus for detecting conductive particles in an oil flow system |
| 06/14/1977 | US4030026 Sampling metal detector |
| 06/07/1977 | US4028707 Antenna for underground pipe detector |
| 05/31/1977 | US4027303 Apparatus for detecting the presence of objects by sensing reflected energy |
| 05/31/1977 | US4027234 Device for measuring terrestrial magnetic field horizontal components and variations thereof |
| 05/31/1977 | US4027232 Device for monitoring the travel of a yarn like structure utilizing the frictional electricity involved with said travel |
| 05/24/1977 | US4025797 Apparatus for detecting the movement of one or more objects |
| 05/17/1977 | US4024468 Induction balance metal detector with inverse discrimination |
| 05/10/1977 | US4023092 Apparatus for sensing metal in wells |
| 05/03/1977 | US4021725 Mobile mine detection system having plural color display |
| 04/26/1977 | US4020451 Methods and apparatus for recording well logging measurements |
| 04/19/1977 | US4019126 Dipmeter means utilizing generated eddy currents and lines of flux in an earth formation |
| 04/19/1977 | US4019125 Well logging pad devices having selective differential relief |
| 04/05/1977 | US4016553 Article detection system with near field electromagnetic wave control |
| 04/05/1977 | US4016529 Body detecting device |
| 04/05/1977 | US4016486 Land mine detector with pulse slope, width and amplitude determination channels |
| 03/29/1977 | US4015197 Method and apparatus for determining permeable zones in subsurface earth formations |
| 03/29/1977 | US4015195 Method of determining hydrocarbon saturation in shaly formations by measuring dielectric constant in first and second portions of the formations |
| 03/15/1977 | US4012690 Device for selectively detecting different kinds and sizes of metals |
| 03/15/1977 | US4012689 Radio frequency resistivity and dielectric constant well logging utilizing phase shift measurement |
| 03/08/1977 | US4010706 Towed device for measuring magnetic field and the vertical gradient thereof at sea |
| 03/01/1977 | US4010476 Methods and apparatus for recording well logging measurements |
| 03/01/1977 | US4010413 Plural frequency geological exploration system and method with phase comparison |
| 02/22/1977 | US4009434 Dielectric induction logging system for obtaining water and residual oil saturation of earth formations |
| 02/15/1977 | US4008469 Signal processing in short-pulse geophysical radar system |
| 02/15/1977 | US4008432 Apparatus for detecting an external magnetic field |
| 02/01/1977 | US4006408 Magnetic material detecting device |
| 01/25/1977 | US4004693 Apparatus for inspecting the disposition of steel ply cords in pneumatic tires |
| 01/25/1977 | US4004540 Galvanic detector for detecting the cutting of a command wire |
| 01/18/1977 | US4004234 Article presence sensor |
| 01/18/1977 | US4004216 Apparatus for detecting metallic particles in a flow of dielectric medium |
| 01/18/1977 | US4004212 Mine detector system |
| 01/11/1977 | US4002063 Well logging pad devices having differential pressure relief |
| 01/04/1977 | US4001745 Intrusion detection transducer |
| 01/04/1977 | US4001718 Linear oscillator for proximity sensor |
| 12/28/1976 | US4000459 Linear ECL distance measuring gauge |
| 12/07/1976 | US3996510 Shielding arrangement for sensing the proximity of a metallic object |
| 11/23/1976 | US3993944 Movable oil measurement combining dual radio frequency induction and dual induction laterolog measurements |
| 11/09/1976 | US3991363 Method and apparatus for detecting faults in buried insulated conductors |
| 11/02/1976 | US3990065 Theft detection system |
| 11/02/1976 | US3990003 Pulsed loop antenna-conduit electromagnetic radiator test technique for electromagnetic shielding flaw detection in buried conduits and shielded conductors |
| 11/02/1976 | US3989932 Inductive loop vehicle detector |
| 10/26/1976 | US3988669 Automatic control and detector for three-terminal resistance measurement |
| 10/26/1976 | US3988663 Locator for metallic pipe with AC signals impressed |
| 10/12/1976 | US3986207 Apparatus for recording in a digital form signals detected during magneto-telluric prospection |
| 10/12/1976 | US3986104 Dual frequency metal detector system |
| 10/05/1976 | US3984764 Inductive loop structure for detecting the presence of vehicles over a roadway |
| 10/05/1976 | US3984759 Apparatus for use in an induced polarization system for measuring the deformation of a periodic signal concealed in noise |
| 10/05/1976 | US3984758 Method and apparatus for geophysical exploration in drill holes by means of very low frequency waves |
| 09/21/1976 | US3982177 Soil sample conductivity measurement utilizing a bridge circuit and plural electrode cell |
| 09/21/1976 | US3982176 Combination radio frequency dielectric and conventional induction logging system |
| 08/31/1976 | US3978396 Method and apparatus for measuring electromagnetic conductivity of a medium and for detecting anomalies therein |
| 08/31/1976 | US3978321 Portable hand-carried automobile counting device |
| 08/31/1976 | US3977072 Method of manufacturing a magnetic locator |
| 08/24/1976 | US3976937 Method and apparatus for recording position of sensor in airborne magnetic surveying |
| 08/17/1976 | US3975735 Discharge pipe line locator |
| 08/17/1976 | US3975693 Dual function laser for space laser communications |
| 08/17/1976 | US3975676 Plural electrode system for determining the electrical parameters of large samples of materials in situ |
| 08/03/1976 | US3973208 Capacitor detector device |
| 08/03/1976 | US3973188 Method and apparatus for the determination of the thickness of a mudcake layer on a borehole wall traversing a subsurface earth formation |
| 08/03/1976 | US3973181 High frequency method and apparatus for electrical investigation of subsurface earth formations surrounding a borehole containing an electrically non-conductive fluid |
| 08/03/1976 | US3972156 Speed-independent static magnetic field metal detector |
| 07/27/1976 | US3971983 Ferromagnetic metal detector utilizing gradiometers positioned on opposite sides of the detection area with overlapping sensitivity |
| 07/27/1976 | US3971103 Safety device for stopping the bale plucking operation |
| 07/20/1976 | US3970927 Method and apparatus including a sensing head with a pair of strip transmission lines for detecting metallic objects |
| 07/13/1976 | US3968637 Yarn break detection by means of triboelectrical noise signal |
| 06/29/1976 | US3967282 Underground pipe detector |