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

Patent Owner(s)

Patent Owner	Address
HORIBA INSTRUMENTS INCORPORATED	IRVINE CA 92618

International Classification(s)

• G01N:INVESTIGATING OR ANALYSING MATERIALS BY DETERMININ....

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Dageforde, Allen F	Orange, CA	5	94
# of filed Patents : 5 Total Citations : 94

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Patent Citation Ranking

• 7 Citation Count
• G01N Class

• 2.26 % this patent is cited more than
• 27 Age

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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: 9448329

Method to determine local variations of the earth's magnetic field and location of the source thereof

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Abstract

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A method to determine the earth's magnetic field vector along a sub-surface wellpath having unknown and possibly changing azimuth, in the presence of a magnetic disturbance caused by a magnetic source external to the wellpath includes estimating the three components of the earth field along the three axes of a magnetic sensor package by a polynomial function of measured depth along the wellpath. Upon removal of the earth's magnetic field from the measurements, the resultant magnetic field of the disturbance is determined and can be used to determine the position and orientation of the source of the disturbance.

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Description

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Claims

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Legal Events

 

• STCH2006
• FP2006
• LAPS2006
• REMI2006
• FPAY2001
• I1998
• F1997
• PD1993

Date	Code	Event	Description
Aug 30, 2006	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Jul 28, 2006	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Jul 28, 2006
Jul 28, 2006	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Feb 15, 2006	REMI	MAINTENANCE FEE REMINDER MAILED
Dec 07, 2001	FPAY	FEE PAYMENT	year of fee payment: 4
Jul 28, 1998	I	Issuance
Feb 28, 1997	F	Filing
Dec 28, 1993	PD	Priority Date