Passive marker device

Details Passive marker device Passive marker device

1986-05-23

1988-08-02

Sikes, William L.

Communications: radio wave antennas

Antennas

Buried underground or submerged under water

343873, 340571, H01Q 140

Patent

active

047616563

ABSTRACT:
A passive marker device including a tuned circuit enclosed in a housing which includes a base member with an upstanding rim with a cover member bonded to the rim and to a central portion of the base member. An opening is provided that extends through the housing at the central portion of the housing. A boss extends from the central portion of the base member to the cover member. The boss is recessed on the side of the base member that is away from the cover.

REFERENCES:
patent: 3216016 (1965-11-01), Tanner
patent: 4217468 (1980-08-01), Rice et al.
patent: 4334227 (1982-06-01), Marks
patent: 4633262 (1986-12-01), Traut
patent: 4682180 (1984-07-01), Crans

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