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:
Jul. 14, 1992
Filed:
Nov. 29, 1990
Mark K Cornwall, Spokane, WA (US);
Karen M Owens, Spokane, WA (US);
Keith Grateful, Spokane, WA (US);
John E Buffington, Post Falls, ID (US);
AMRplus Partners, Spokane, WA (US);
Abstract
A sensor for detecting the rotation of an eddy wheel in an electric power meter is described. The sensor includes a pair of light sources arranged to focus light on the edge of the wheel, and a light detector arranged to sense reflections from the edge of the wheel caused by the light from the light sources. The light from either sensor is sufficient to trigger the detector, thereby requiring a sufficiently large interruption in the reflection, for example as caused by a mark on the edge of the eddy wheel, to interrupt the detector output. A filter is described for eliminating jitter in rotation of the eddy wheel.