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:
Mar. 10, 2009
Filed:
Dec. 16, 2004
Kevin M Brunson, Worcestershire, GB;
David O King, Worcestershire, GB;
Kevin M Brunson, Worcestershire, GB;
David O King, Worcestershire, GB;
QinetiQ Limited, London, GB;
Abstract
A magnetic field sensor device () is described that comprises an oscillatory member () and current control means (). The current control means () is arranged to pass an alternating current (AC) along at least first () and second () current paths provided through the oscillatory member () and is arranged to provide magnetic gradiometer mode operation (i.e. to measure magnetic field gradient) in which current flow through the first current path () is in substantially the opposite direction to current flow through the second current path (). The current control means () can also prove magnetometer mode operation (i.e. to measure magnetic field strength). The magnetic field sensor () may be used in a compass.