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

Patent Owner(s)

Patent Owner	Address
INDUCTIVE SIGNATURE TECHNOLOGIES INC	608 GAY STREET SW SUITE 210 KNOXVILLE TN 37902

International Classification(s)

• G08G:TRAFFIC CONTROL SYSTEMS

• 2000 Application Filing Year
• G08G Class
• 278 Applications Filed
• 153 Patents Issued To-Date
• 55.04 % Issued To-Date

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Hilliard, Geoffrey W	Signal Mountain, TN	8	136
# of filed Patents : 8 Total Citations : 136
Hilliard, Steven R	Burlington, NC	17	330
# of filed Patents : 17 Total Citations : 330

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Patent Citation Ranking

• 14 Citation Count
• G08G Class

• 34.43 % this patent is cited more than
• 23 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: 6380868

Permeability-modulated carrier referencing

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Abstract

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An apparatus and method for measuring the inductance of a wire-loop without direct reference to any particular time-constant or frequency. Low-frequency noise induced into the wire-loop is canceled within the detector circuit and crosstalk between a plurality of adjacent wire-loops is nullified using passive transformers. New wire-loop configurations utilize the permeability-modulated carrier referencing to provide repeatable inductive signatures with less intrusive, and non-intrusive installations.

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Description

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Claims

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Legal Events

 

• STCH2014
• FP2014
• LAPS2014
• REMI2013
• SULP2010
• FPAY2010
• REMI2009
• FPAY2005
• I2002
• F2000
• PD1999

Date	Code	Event	Description
May 26, 2014	STCH	INFORMATION ON STATUS: PATENT DISCONTINUATION	free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362
Apr 30, 2014	FP	LAPSED DUE TO FAILURE TO PAY MAINTENANCE FEE	Effective Date: Apr 30, 2014
Apr 30, 2014	LAPS	LAPSE FOR FAILURE TO PAY MAINTENANCE FEES
Dec 06, 2013	REMI	MAINTENANCE FEE REMINDER MAILED
Apr 30, 2010	SULP	SURCHARGE FOR LATE PAYMENT	year of fee payment: 7
Apr 30, 2010	FPAY	FEE PAYMENT	year of fee payment: 8
Dec 07, 2009	REMI	MAINTENANCE FEE REMINDER MAILED
Oct 25, 2005	FPAY	FEE PAYMENT	year of fee payment: 4
Apr 30, 2002	I	Issuance
Mar 22, 2000	F	Filing
Mar 22, 1999	PD	Priority Date