Electronic marker device and method of making same

Details Electronic marker device and method of making same Electronic marker device and method of making same

1980-09-26

1982-06-08

Lieberman, Eli

Communications: radio wave antennas

Antennas

Buried underground or submerged under water

343867, 343873, 29600, H01Q 140, H01Q 104

Patent

active

043342272

ABSTRACT:
Passive type electronic marker device is hoop shaped, with the hoop thickness in the radial direction being substantially less than the hoop width in the axial direction and with a tuned circuit disposed within the hoop. Improved structure and the method involves a mandrel portion on which the tuned circuit coil is wound, a mating cover band, and special peripheral hermetic seals.

REFERENCES:
patent: 2863147 (1958-12-01), Berlin
patent: 3216016 (1965-11-01), Tanner
patent: 4187509 (1980-02-01), Weiner

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