The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 30, 2002
Filed:
Mar. 22, 2000
Applicant:
Inventors:
Steven R. Hilliard, Burlington, NC (US);
Geoffrey W. Hilliard, Signal Mountain, TN (US);
Assignee:
Inductive Signature Technologies, Inc., Knoxville, TN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G08G 1/01 ;
U.S. Cl.
CPC ...
G08G 1/01 ;
Abstract
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.