Patents Assigned to Aphel, Ltd.
  • Subtractive current measuring method
    Patent number: 7583075
    Abstract: The present invention is a subtractive current measuring system for a power receptacle. The system may comprise one or more of the following features: (a) a power receptacle; (b) a current carrying input wire; (c) a current carrying output wire; (d) a current transformer; (e) an electrical measuring device; and (f) interconnecting circuitry linking the current transformer and the electrical measuring device.
    Type: Grant
    Filed: December 5, 2006
    Date of Patent: September 1, 2009
    Assignees: Geist Manufacturing, Inc., Aphel, Ltd.
    Inventor: Hugh G. Hutchison