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:
Dec. 30, 1997
Filed:
Oct. 04, 1993
John W Bieberdorf, Perry, OK (US);
John C Wisehart, Stillwater, OK (US);
Greg W Draper, Perry, OK (US);
The Charles Machine Works, Inc., Perry, OK (US);
Abstract
The pitch sensor of the invention includes a sealed container filled about half full with a magnetic liquid. A pair of coils are wound around the container and produce inductances corresponding to the amount of magnetic liquid disposed within the opening of the coils. As the angle of inclination of the pitch sensor changes, the volume of magnetic liquid becomes greater in one coil, as compared to the other coil, thereby providing a differential inductance. A pulsing circuit pulses the inductances and produces an analog voltage corresponding to the absolute angle of pitch, and a polarity voltage corresponding to the angle quadrant.