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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	1570

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	158
Jeandey, Christian	St. Egreve, FR	13	151
Locatelli, Marcel	Montbonnot, FR	16	176

Cited Art Landscape

Patent Info	(Count)	# Cites	Year
Other [Check patent profile for assignment information] (2)
* 4,529,939 System located in drill string for well logging while drilling		86	1983
* 5,283,520 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)
* 4,593,770 Method for preventing the drilling of a new well into one of a plurality of production wells		43	1984
HALLIBURTON LOGGING SERVICES, INC. (1)
* 5,038,107 Method and apparatus for making induction measurements through casing		43	1989
WESTERN ATLAS INTERNATIONAL, INC. (1)
* 4,901,023 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)
* 5,892,460 Logging while drilling tool with azimuthal sensistivity		53	1997
6,181,138 Directional resistivity measurements for azimuthal proximity detection of bed boundaries		124	1999
Other [Check patent profile for assignment information] (3)
* 5,841,510 Rotatable diagnostic lens for evaluation of the irido-corneal angle, retina and other portions of the eye		9	1998
* 6,975,120 Measurement of subterranean lithology using electromagnetic energy		6	2002
* 2003/0117,142 Measurement of subterranean lithology using electromagnetic energy		4	2002
KJT Enterprises, Inc. (4)
6,975,121 System for measuring earth formation resistivity through and electrically conductive wellbore casing		6	2004
7,388,382 System for measuring Earth formation resistivity through an electrically conductive wellbore casing		5	2004
7,202,671 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		5	2004
SCHLUMBERGER TECHNOLOGY CORPORATION (9)
6,534,986 Permanently emplaced electromagnetic system and method for measuring formation resistivity adjacent to and between wells		19	2001
6,791,331 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
7,030,617 System, apparatus, and method for conducting electromagnetic induction surveys		16	2004
* 2005/0156,602 System, apparatus, and method for conducting electromagnetic induction surveys		3	2004
* 8,310,239 Detecting electrical current in a magnetic structure		2	2009
* 2010/0134,112 DETECTING ELECTRICAL CURRENT IN A MAGNETIC STRUCTURE		2	2009
9,069,097 Surface to borehole electromagnetic surveying using metallic well casings as electrodes		1	2009
* 2014/0132,272 Analyzing Subterranean Formation With Current Source Vectors		1	2013
EMI, INC. (1)
6,294,917 Electromagnetic induction method and apparatus for the measurement of the electrical resistivity of geologic formations surrounding boreholes cased with a conductive liner		51	1999
EM-Tech Sensors LLC (6)
6,657,440 Propagation of waves through materials		3	1999
6,628,118 Method and apparatus for control of magnetic flux direction and concentration		12	2000
6,597,177 Through casing resistivity measurement in permanently installed downhole production environment		4	2000
* 6,744,263 Apparatus and method for the measurement of electrical properties of materials through non-magnetizable materials		2	2000
* 6,597,186 Through tank level gauging		0	2000
6,630,831 Measurements of electrical properties through non magneticially permeable metals using directed magnetic beams and magnetic lenses		17	2001
EM-TECH LLC (3)
6,392,421 Spectral EM frequency metallic thickness measurement using metallic transparencies		6	2000
6,553,838 Detection of anomalies on railroad tracks		6	2001
7,019,518 Non-contacting apparatus and method for measurement of ferromagnetic metal thickness		1	2001
WESTERN ATLAS INTERNATIONAL, INC. (4)
* 6,025,721 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		23	1996
* 6,157,195 Formation resistivity measurements from within a cased well used to quantitatively determine the amount of oil and gas present		31	1997
6,246,240 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
6,987,386 Determining resistivity of a geological formation using circuitry located within a borehole casing		3	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

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Full Text

US Patent No: 5,654,639

Induction measuring device in the presence of metal walls

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