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:
Sep. 15, 1992
Filed:
Mar. 18, 1991
Richard A Balch, North Hampton, NH (US);
David D Elmore, Somersworth, NH (US);
General Electric Company, Somersworth, NH (US);
Abstract
An apparatus and method to detect and avoid inaccuracies in an electronic energy meter due to reverse rotation of the eddy current disk in response to pull-back and creep of the disk, or tampering, including the detection of reverse rotation by checking each three successive states of light transmission between two light emitter/detector pairs in response to an optical castellated disk passing between the emitter/detector pairs, storing pulses generated by the reverse rotation and subtracting the stored pulses upon a subsequent reversal of rotation to the forward direction. Upon reverse rotation in excess of one revolution, the stored pulses are counted along with the counting of the additional reverse rotation pulses and an error signal is generated for subsequent display in response to a command signal.