Etching a substrate: processes – Forming or treating electrical conductor article
Patent
1997-03-27
1999-01-26
Powell, William
Etching a substrate: processes
Forming or treating electrical conductor article
216 20, 216 33, 324329, 324149, B44C 122
Patent
active
058634452
ABSTRACT:
The present invention in one embodiment provides a metal detector comprising a coil, a circuit board on which the coil is etched, a digital signal processor, and a warning circuit, and battery power source. When a sufficient amount of metal is near the coil, the digital signal processor activates a device or devices in the warning circuit. In another embodiment the circuit board on which the coil is placed is used in conjunction with a one piece molded housing. In another embodiment the present invention, provides a metal detector comprising an elongated coil etched onto an elongated circuit board. At least one active device, which is part of detection circuitry is also preferably placed on the elongated circuit board. The detection circuitry in one embodiment, includes circuitry which together with the elongated coil forms an oscillator circuit. The elongated covering case in one embodiment is molded substantially seamlessly by blowmold, extrusion, or injection mold.
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Copies of photographs of C.E.I.A. device (Exhs. 1 through 9).
Biscamp Andrew
Conway Brad
Geisel Karl E.
Control Screening L.L.C.
Powell William
Tencza, Jr. Walter J.
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