Marker for locating a buried object

Details Marker for locating a buried object Marker for locating a buried object

1987-10-09

1989-10-10

Hille, Rolf

Communications: radio wave antennas

Antennas

High frequency type loops

343719, 324329, 340572, H01Q 104, H01Q 140

Patent

active

048735337

ABSTRACT:
A marker for positioning near a buried object wherein the marker can be detected to locate the buried object. The marker includes a passive resonant type antenna which becomes inoperative when the initial position for the buried marker is changed. A lead wire and/or a mercury switch that is a part of the antenna serve to make the antenna inoperative due to such change in the initial position of the marker.

REFERENCES:
patent: 3216016 (1965-11-01), Tanner
patent: 3836842 (1974-09-01), Zimmermann et al.
patent: 4334227 (1982-06-01), Marks
patent: 4618861 (1986-10-01), Gettens et al.
patent: 4712094 (1987-12-01), Bolson, Sr.
patent: 4755806 (1988-07-01), Villarreal

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