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. 17, 2026
Filed:
Mar. 22, 2023
Allegro Microsystems, Llc, Manchester, NH (US);
Rémy Lassalle-Balier, Bures sur Yvette, FR;
Alexander Latham, Harvard, MA (US);
Allegro MicroSystems, LLC, Manchester, NH (US);
Abstract
Methods and apparatus for sensors having a main coil to direct a magnetic field at a rotatable target for inducing eddy currents in the target and a receive coil having sine and cosine coils for detecting a reflected field from the target wherein each of the sine and cosine coils is configured such that an asymmetric reflected field from the target seen by the sine and cosine coils corresponds to conductive properties of a surface of the target in relation to the main coil and the receive coil. The sine coil comprises first and second constituent coils offset from each other to compensate for third order harmonic effects and the cosine coil comprises first and second constituent coils to compensate for third order harmonic effects.