Buried structure detection device

Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters

Reexamination Certificate

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Details

C324S326000, C324S686000

Reexamination Certificate

active

06998854

ABSTRACT:
An underground buried object detecting apparatus has a capacitance sensor attached to a base plate to be faced to the ground, to detect an underground capacitance change, a stored value of a reference capacitance corresponding to the absence of a buried object, a comparing operation device for comparing detected capacitance with the stored capacitance value, and a buzzer for receiving a signal from the operation device and indicating presence of a buried object.

REFERENCES:
patent: 4992741 (1991-02-01), Douglas et al.
patent: 5617031 (1997-04-01), Tuttle
patent: 6097190 (2000-08-01), Foerster
patent: 6326790 (2001-12-01), Ott et al.
patent: 6486673 (2002-11-01), Goldfine et al.
patent: 7-2987 (1995-01-01), None
patent: 9-33194 (1997-02-01), None
patent: 2000-266843 (2000-09-01), None
patent: 2001-264448 (2001-09-01), None

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