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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address	Total Patents
COMMISSARIAT A L'ENERGIE ATOMIQUE	PARIS	1496

International Classification(s)

• G01V:GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING ....
• G21C:NUCLEAR REACTORS

• [Classification Symbol]

• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Chaillout, Jean-Jacques	St. Etienne de Croney, FR	18	176
Jeandey, Christian	St. Egreve, FR	13	162
Locatelli, Marcel	Montbonnot, FR	16	194

Cited Art Landscape

Patent Info	(Count)	# Cites	Year
Other [Check patent profile for assignment information] (2)
* 4529939 System located in drill string for well logging while drilling		91	1983
* 5283520 Method of determining thickness of magnetic pipe by measuring the time it takes the pipe to reach magnetic saturation		26	1991
Mobil Oil Corporation (1)
* 4593770 Method for preventing the drilling of a new well into one of a plurality of production wells		53	1984
Halliburton Logging Services, Inc. (1)
* 5038107 Method and apparatus for making induction measurements through casing		45	1989
WESTERN ATLAS INTERNATIONAL, INC. (1)
* 4901023 Methods and apparatus for measurement of low frequency a.c. magnetic fields within cased boreholes to determine properties of geological formations		25	1988

* Cited By Examiner

Patent Citation Ranking

Forward Cite Landscape

Patent Info	(Count)	# Cites	Year
HALLIBURTON ENERGY SERVICES, INC. (2)
* 5892460 Logging while drilling tool with azimuthal sensistivity		58	1997
6181138 Directional resistivity measurements for azimuthal proximity detection of bed boundaries		138	1999
Other [Check patent profile for assignment information] (3)
* 5841510 Rotatable diagnostic lens for evaluation of the irido-corneal angle, retina and other portions of the eye		18	1998
* 6975120 Measurement of subterranean lithology using electromagnetic energy		7	2002
* 2003/0117,142 Measurement of subterranean lithology using electromagnetic energy		5	2002
KJT Enterprises, Inc. (4)
6975121 System for measuring earth formation resistivity through and electrically conductive wellbore casing		7	2004
7388382 System for measuring Earth formation resistivity through an electrically conductive wellbore casing		8	2004
7202671 Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response		11	2004
* 2006/0028,208 Method and apparatus for measuring formation conductivities from within cased wellbores by combined measurement of casing current leakage and electromagnetic response		7	2004
SCHLUMBERGER TECHNOLOGY CORPORATION (10)
6534986 Permanently emplaced electromagnetic system and method for measuring formation resistivity adjacent to and between wells		30	2001
6791331 Method and apparatus for measuring characteristics of geological formations		10	2004
* 2004/0145,370 Method and apparatus for measuring characteristics of geological formations		4	2004
7030617 System, apparatus, and method for conducting electromagnetic induction surveys		18	2004
* 2005/0156,602 System, apparatus, and method for conducting electromagnetic induction surveys		5	2004
* 8310239 Detecting electrical current in a magnetic structure		2	2009
* 2010/0134,112 DETECTING ELECTRICAL CURRENT IN A MAGNETIC STRUCTURE		5	2009
9069097 Surface to borehole electromagnetic surveying using metallic well casings as electrodes		3	2009
* 9625604 Analyzing subterranean formation with current source vectors		0	2013
* 2014/0132,272 Analyzing Subterranean Formation With Current Source Vectors		1	2013
EMI, INC. (1)
6294917 Electromagnetic induction method and apparatus for the measurement of the electrical resistivity of geologic formations surrounding boreholes cased with a conductive liner		59	1999
EM-Tech Sensors LLC (6)
6657440 Propagation of waves through materials		3	1999
6628118 Method and apparatus for control of magnetic flux direction and concentration		12	2000
6597177 Through casing resistivity measurement in permanently installed downhole production environment		4	2000
* 6744263 Apparatus and method for the measurement of electrical properties of materials through non-magnetizable materials		2	2000
* 6597186 Through tank level gauging		0	2000
6630831 Measurements of electrical properties through non magneticially permeable metals using directed magnetic beams and magnetic lenses		19	2001
EM-TECH LLC (3)
6392421 Spectral EM frequency metallic thickness measurement using metallic transparencies		6	2000
6553838 Detection of anomalies on railroad tracks		14	2001
7019518 Non-contacting apparatus and method for measurement of ferromagnetic metal thickness		1	2001
WESTERN ATLAS INTERNATIONAL, INC. (4)
* 6025721 Determining resistivity of a formation adjacent to a borehole having casing by generating constant current flow in portion of casing and using at least two voltage measurement electrodes		24	1996
* 6157195 Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present		31	1997
6246240 Determining resistivity of a formation adjacent to a borehole having casing with an apparatus having all current conducting electrodes within the cased well		32	1999
6987386 Determining resistivity of a geological formation using circuitry located within a borehole casing		4	2002

* Cited By Examiner

Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent No: 5654639

Induction measuring device in the presence of metal walls

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