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. 09, 2004
Filed:
Feb. 18, 2002
Applicant:
Inventor:
John M. Kaste, Fort Wayne, IN (US);
Assignee:
Phoenix America, Inc., Fort Wayne, IN (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01B 7/14 ; G01R 3/500 ; H03K 1/795 ; H01F 7/02 ;
U.S. Cl.
CPC ...
G01B 7/14 ; G01R 3/500 ; H03K 1/795 ; H01F 7/02 ;
Abstract
A tunable magnetic device which includes a permanent magnet in the shape of a ring, an inner aperture, a tuning member, and a field sensor secured to the permanent magnet. The tuning member may be a ferrous or magnetic material and may be secured to a non-magnetic tuning device. The inner aperture is preferably small compared to the permanent magnet. The magnetic device provides a magnetic field that is sensitive to the proximity of a ferrous object and provides a tunable mechanism to locally balance the magnetic field where the field sensor is located.