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:
Jun. 27, 2006
Filed:
Apr. 28, 2004
Michael B. Hintz, Mahtomedi, MN (US);
Richard E. Jewett, Minneapolis, MN (US);
Steven L. Lindblom, Inver Grove Heights, MN (US);
Stephen J. Rothermel, Roseville, MN (US);
Michael B. Hintz, Mahtomedi, MN (US);
Richard E. Jewett, Minneapolis, MN (US);
Steven L. Lindblom, Inver Grove Heights, MN (US);
Stephen J. Rothermel, Roseville, MN (US);
Imation Corp., Oakdale, MN (US);
Abstract
A magnetic field strength detector includes a magnetic field sensing element that outputs voltage as a function of magnetic field strength. In some embodiments, the magnetic field sensing element comprises a coil, and voltage is induced across the coil as a function of the magnetic field strength. A magnetic field strength detector also includes an indicator that alters as a function of the voltage output by the magnetic field sensing element when the magnetic field strength exceeds a threshold. The alteration is substantially irreversible and, in some embodiments, visible. The detector may be used to, for example, measure the strength of a magnetic field generated by a degaussing device, or to confirm that a particular medium was exposed to a magnetic field with a strength adequate to degauss the medium.