Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Reexamination Certificate
2006-08-04
2008-12-16
Aurora, Reena (Department: 2862)
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
C324S326000
Reexamination Certificate
active
07466134
ABSTRACT:
An apparatus for locating underground cast iron pipe joints having an electrically driven resonant coil generating an alternating magnetic field and two resonant sensor coils disposed within the alternating magnetic field, each of the resonant sensor coils having an independent magnetic reluctance circuit. A device is provided for comparing electrical currents induced in each of the resonant sensor coils and a device is provided for indicating a relative magnitude of the electrical currents.
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Aurora Reena
Fejer Mark E.
Gas Technology Institute
Whittington Kenneth J
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