Magnetic marker

Details Magnetic marker Magnetic marker

1978-09-18

1980-09-16

Kilgore, Robert M.

Registers

Records

Magnetic

340572, 3461351, 156269, 156302, G06K 1906, G08B 1314, G01D 1524

Patent

active

042225175

ABSTRACT:
The present invention relates to an improved magnetic marker and method for manufacturing same. The marker includes a ribbon of magnetic signal material of relatively low coercivity having coupled thereto at least two control elements of a ferro-magnetic material which may be permanently magnetized by a control signal in order to saturate the strip of first ferromagnetic material, thereby preventing the first ferromagnetic material from generating higher order harmonics when interrogated by a periodic magnetic signal of fundamental frequency.

REFERENCES:
patent: 3586593 (1971-06-01), Dahl
patent: 3631442 (1971-12-01), Fearon
patent: 3746606 (1973-07-01), Chao
patent: 3765007 (1973-10-01), Elder
patent: 3820103 (1974-06-01), Fearon
patent: 3820104 (1974-06-01), Fearon
patent: 3870867 (1975-03-01), Hamisch
patent: 4151405 (1979-04-01), Peterson

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