Inventor
ANGEHRN JORG A
US21 patents
⚠️ This page may combine multiple inventors who share the name “ANGEHRN JORG A”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CHEVRON RES
11 patentsUS4722603AFeb 2, 1988
Interferometric means and method for accurate determination of fiber-optic well logging cable length
CHEVRON RES37 citations91
US4714889ADec 22, 1987
Method of interpreting impedance distribution of an earth formation using precursor logging data provided by a multi-electrode logging array stationary within a borehole
CHEVRON RES36 citations91
US4703279AOct 27, 1987
Method of interpreting impedance distribution of an earth formation penetrated by a borehole using precursor data provided by a moving logging array having a single continuously emitting current electrode and a multiplicity of potential electrodes
CHEVRON RES27 citations91
US4862424AAug 29, 1989
Interferometric means and method for accurate determination of fiberoptic well logging cable length
CHEVRON RES8 citations72
US4803479AFeb 7, 1989
Electrical phase measurement means and method for accurate determination of well logging cable length
CHEVRON RES10 citations72
US4677385AJun 30, 1987
Methd of logging an earth formation penetrated by a borehole to provide an estimate of impedance distribution with depth using end emitting current electrodes sequentially activated and a multiplicity of potential electrodes of a moving logging array
CHEVRON RES16 citations72
US4677386AJun 30, 1987
Method of interpreting impedance distribution of an earth formation obtained by a moving array using end emitting current electrodes sequentially activated and a series of potential electrodes
CHEVRON RES12 citations72
US4675610AJun 23, 1987
Method of logging an earth formation penetrated by a borehole to provide an improved estimate of impedance distribution with depth using a single continuously emitting current electrode and a multiplicity of potential electrodes of a moving logging array
CHEVRON RES12 citations72
US4675611AJun 23, 1987
Method of logging an earth formation penetrated by a borehole to provide an improved estimate of impedance distribution of the formation
CHEVRON RES18 citations72
US4711122ADec 8, 1987
Flexible mud excluder for borehole televiewer
CHEVRON RES10 citations66
US4847814AJul 11, 1989
Three-dimensional borehole televiewer display
CHEVRON RES4 citations63
DRESSER IND
6 patentsUS4556884ADec 3, 1985
Depth dependent multiple logging system
DRESSER IND52 citations87
US4271356AJun 2, 1981
Method and apparatus for natural gamma ray spectrum analysis using microprocessor stripper
DRESSER IND27 citations79
US4402068AAug 30, 1983
Method and apparatus for acoustic well logging
DRESSER IND19 citations74
US4320470AMar 16, 1982
Method and apparatus for acoustic well logging
DRESSER IND15 citations74
US4514809AApr 30, 1985
Dynamic range control of electrode pad current in well logging tools
DRESSER IND11 citations72
US4346593AAug 31, 1982
Well logging correction method and apparatus
DRESSER IND15 citations70
CHEVRON RES & TECH
3 patentsUS5164548ANov 17, 1992
Method and apparatus for ultrasonic scanning of a borehole having improved sensor array and timing circuit
CHEVRON RES & TECH38 citations92
US5276656AJan 4, 1994
Method for fluid identification and evaluation within wellbores using ultrasonic scanning
CHEVRON RES & TECH11 citations72
US5138585AAug 11, 1992
Method for fluid identification and evaluation within wellbores using ultrasonic scanning
CHEVRON RES & TECH9 citations72