| Patents for G01V 3 - Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination or deviation (25,929) |
|---|
| 06/27/1979 | EP0002609A1 A system controlling apparatus |
| 06/27/1979 | EP0002608A1 Sensing transducer |
| 06/26/1979 | CA1057354A1 Surveying of subterranean magnetic bodies from adjacent off-vertical borehole |
| 06/12/1979 | US4158165 Apparatus and method for determining subsurface formation properties |
| 06/05/1979 | US4157579 Pulse generation employing parallel resonant LC circuit for energizing a coil with square wave |
| 05/29/1979 | US4156820 Miniature contactless switching unit |
| 05/22/1979 | US4156178 Terrestrial magnetism responsive device including a pair of balanced north seeking magnets rotatable on a magnetic axis |
| 05/22/1979 | US4156177 Apparatus and method for determination of free fluid in subsurface formations |
| 05/22/1979 | CA1055118A2 Method using induced polarization for ore discrimination in disseminated earth deposits |
| 05/15/1979 | CA1054695A1 Article presence sensor |
| 05/01/1979 | CA1053755A1 Dielectric induction logging system for obtaining water and residual oil saturation of earth formations |
| 04/24/1979 | US4151458 Closely spaced pipe-to-soil electrical survey method and apparatus |
| 04/24/1979 | US4151457 Microwave method and apparatus for determination of adsorbed fluid in subsurface formations |
| 04/24/1979 | CA1053332A1 Spectral analysis electromagnetic survey system |
| 04/10/1979 | CA1052444A1 Fault locator |
| 04/03/1979 | US4147973 Frequency dependent amplitude modulated translator apparatus |
| 03/27/1979 | CA1051518A1 Well logging methods and apparatus |
| 03/13/1979 | US4144486 Apparatus for testing metal detectors |
| 03/13/1979 | CA1050628A1 Inductive loop detector system |
| 02/20/1979 | US4140971 Proximity detection system utilizing a movable magnet for saturating an inductor core wherein the rise time of a plurality of such inductors are compared |
| 02/20/1979 | CA1049093A1 Radio frequency resistivity and dielectric constant well logging utilizing phase shift measurement |
| 02/13/1979 | CA1048403A1 Well logging pad devices having differential pressure relief |
| 01/30/1979 | USRE29896 Intrusion detection system |
| 01/30/1979 | US4137500 Frequency dependent amplitude modulated exciter apparatus |
| 01/30/1979 | CA1047623A1 Inductive loop vehicle detector |
| 01/30/1979 | CA1047596A1 Methods and apparatus for recording well logging measurements |
| 01/16/1979 | US4135184 Electronic theft detection system for monitoring wide passageways |
| 01/16/1979 | US4135183 Antipilferage system utilizing "figure-8" shaped field producing and detector coils |
| 01/09/1979 | US4134110 Transceiver with skewed transducers for low close-in sensitivity |
| 01/09/1979 | US4134061 Pipe current detector with plural magnetic flux detectors |
| 01/02/1979 | US4132943 Remote sensing of hydrocarbon gas seeps utilizing microwave energy |
| 12/26/1978 | US4131848 Digital loop detector with automatic tuning |
| 12/26/1978 | CA1045204A2 Method of determining hydrocarbon saturation in shally formations |
| 12/26/1978 | CA1045203A2 Method of determining hydrocarbon saturation in shally formations |
| 12/19/1978 | US4130793 Dielectric well logging means and method utilizing the signals from a pair of receivers for providing clock pulses corresponding to earth formation dielectric constant |
| 12/19/1978 | US4130792 Metal detector with feedback tuning |
| 12/19/1978 | US4130791 Automatic pipe depth locator |
| 12/19/1978 | US4130763 Machine guard installations |
| 12/12/1978 | US4129821 Determination of remanent magnetization of an earth formation penetrated by a bore hole using a magnetometer-followed by processing of data including micropulsation data |
| 12/05/1978 | US4128803 Metal detector system with ground effect rejection |
| 11/28/1978 | CA1043421A1 Method of determining hydrocarbon saturation in shaly formations |
| 11/14/1978 | US4125804 Mobile radar method for sensing inclusions in subsoil |
| 11/07/1978 | US4124848 Range limited area protection system |
| 11/07/1978 | CA1042075A1 Method and apparatus for measuring ellipse parameters of electromagnetic polarization in geophysical exploration |
| 10/24/1978 | US4122387 Apparatus and method for simultaneously logging an electrical characteristic of a well formation at more than one lateral distance from a borehole |
| 10/17/1978 | CA1040709A1 Method using induced polarization for ore discrimination in disseminated earth deposits |
| 10/17/1978 | CA1040708A1 Combination radio frequency dielectric and conventional induction logging system |
| 10/17/1978 | CA1040707A1 Determination of the polarity of remanent magnetization of a subsurface formation |
| 10/10/1978 | US4119951 Microwave intrusion sensing units and antenna therefor |
| 10/10/1978 | US4119908 Method for locating buried markers which are disposed along the path of an underground conductor |
| 10/10/1978 | CA1040261A1 Method and apparatus for investigating earth formations |
| 10/03/1978 | US4118693 Method and apparatus for producing uniform electromagnetic fields in an article detection system |
| 10/03/1978 | US4118662 Apparatus including bifrequency electromagnetic wave generation means for sympathetic excitation of detached conductive structures |
| 09/26/1978 | US4117466 Beat frequency interference rejection circuit |
| 09/26/1978 | US4117394 Well logging apparatus with pad-mounted vertical electrode array for measuring the resistivity of the flushed zone |
| 09/26/1978 | US4116045 Oil detector |
| 09/26/1978 | CA1039357A1 Determination of the polarity of remanent magnetization of a sub-surface formation |
| 09/12/1978 | US4114086 Inductive source method of induced polarization prospecting |
| 09/05/1978 | US4112408 Device for producing an electrical pulse in response to passage of a magnetically conducting member through an air gap |
| 09/05/1978 | US4112349 Apparatus including bivolumetric tone subaudition means for positionally spotting and tracing subjacently concealed conductive structures |
| 09/05/1978 | CA1038036A1 Sampling metal detector |
| 08/29/1978 | US4110689 Magnetic detecting apparatus with novel means for positioning sensor assembly in a housing |
| 08/29/1978 | US4110688 Method and apparatus for pipe joint locator, counter and displacement calculator |
| 08/29/1978 | US4110682 Well logging apparatus with pad-mounted array of vertical electrodes of different lengths for measuring the resistivity of the flushed zone |
| 08/29/1978 | US4110679 Ferrous/non-ferrous metal detector using sampling |
| 08/29/1978 | US4109522 Method of borehole logging using passive Josephson current detector to directly determine the presence of hydrocarbons |
| 08/22/1978 | CA1037153A1 Method and apparatus for geophysical prospecting by very low frequency waves |
| 08/22/1978 | CA1037121A1 Magnetic locator having improved sensors |
| 08/22/1978 | CA1037118A1 Method and apparatus for investigating earth formations |
| 08/15/1978 | US4107604 Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device |
| 08/15/1978 | US4107598 Electromagnetic wave logging system for determining resistivity and dielectric constant of earth formations |
| 08/15/1978 | US4107597 Electromagnetic wave propagation well logging utilizing multiple phase shift measurement |
| 07/18/1978 | US4101873 Device to locate commonly misplaced objects |
| 07/11/1978 | US4100491 Automatic self-cleaning ferromagnetic metal detector |
| 07/11/1978 | US4100483 Dielectric well logging system and method with error correction |
| 07/11/1978 | US4100482 Method and apparatus for measuring ellipse parameters of electromagnetic polarization in geophysical exploration |
| 07/11/1978 | US4100481 Hydrocarbon exploration with display of re-radiated and reflected microwave energy |
| 07/04/1978 | US4099118 Electronic wall stud sensor |
| 07/04/1978 | US4099116 Metal detector with phase related circuit selective discrimination |
| 06/20/1978 | US4096432 Metal detectors for discriminatory detection of buried metal objects |
| 06/20/1978 | US4095457 Apparatus for detecting changes in parameters of liquid flowing in a pipe based on sing-around method |
| 06/13/1978 | US4095214 Electronic monitoring system and responder device |
| 06/13/1978 | US4095169 Method for locating discontinuities in the electrical conductivity of the sub-soil using a plurality of magnetic detectors in a predetermined spatial arrangement |
| 06/13/1978 | US4095167 Concealed structure locating and surveying exciter |
| 05/30/1978 | US4092583 Apparatus and method for determination of subsurface porosity utilizing microwave electromagnetic energy |
| 05/30/1978 | US4092217 Fuel elements for nuclear reactors and method for testing the circulation of fuel elements in a core of a nuclear reactor |
| 05/23/1978 | US4091322 Eddy current generating type metal pipeline detector |
| 05/09/1978 | US4088998 System for detecting nuclear explosions |
| 05/09/1978 | US4088946 Magnetic bridge transducer formed with permanent magnets and a hall effect sensor for identifying the presence and location of ferromagnetic discontinuities within or on a tubular specimen |
| 05/09/1978 | US4088945 Logging probe for making redox potential measurements |
| 05/02/1978 | US4087741 Downhole geoelectric remote sensing method |
| 05/02/1978 | US4087740 Spherical focusing method and apparatus for determining the thickness of a zone in an earth formation traversed by a borehole |
| 05/02/1978 | US4087739 Earth formation permeability determining technique using synthetic resistivity parameters |
| 04/18/1978 | US4085360 Method and apparatus for determining the presence of or absence of an underground body |
| 04/11/1978 | USRE29610 Field strength uniformity control system |
| 04/11/1978 | US4084135 System and method for checking the sensitivity and performance of an electromagnetic field variation detector |
| 04/11/1978 | CA1029441A1 Apparatus for digital recording of signals detected in magnetotelluric surveying |
| 03/14/1978 | US4079309 Method for determining changes in earth resistivity by measuring phase difference between magnetic field components |
| 02/28/1978 | US4077003 Microwave method and apparatus utilizing dielectric loss factor measurements for determination of adsorbed fluid in subsurface formations surrounding a borehole |
| 02/21/1978 | US4075563 Digital loop detector with improved detection control |