Method and apparatus for locating underground cast iron pipe...

Details Method and apparatus for locating underground cast iron pipe... Method and apparatus for locating underground cast iron pipe...

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.

REFERENCES:
patent: 3823365 (1974-07-01), Anderson
patent: 4091322 (1978-05-01), Stankoff
patent: 4486712 (1984-12-01), Weber
patent: 4507608 (1985-03-01), Flach et al.
patent: 5617031 (1997-04-01), Tuttle
patent: 5640092 (1997-06-01), Motazed et al.
patent: 5650725 (1997-07-01), Powell et al.
patent: 5729143 (1998-03-01), Tavernetti et al.

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