Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1999-05-06
2000-03-28
Hofsass, Jeffery A.
Communications: electrical
Condition responsive indicating system
Specific condition
364560, 364715, 356 30, 356301, 356432, 2504611, G08B 2100
Patent
active
060437421
ABSTRACT:
An apparatus and process for detecting man-made gemstones using an alternating current conducted through a sample gemstone is provided. The apparatus includes a hand-held housing in which is disposed electronic circuitry, a probe which extends from the housing, and a transmitting stimulus electrode in the form of a body-contact touchpad. The electronic circuitry includes a filter for eliminating non-transmitted signals sensed by the probe, and produces an alternating current signal, preferably in sine wave form, for delivery to the touchpad. The alternating current signal is transmitted through the operator of the apparatus into the sample gemstone. The operator probes the gemstone by touching the conductive probe to the gemstone in an attempt to sense signals conducted through the gemstone. An alarm is activated upon the detection of the conducted transmitted signal, indicating that the gemstone is man-made.
REFERENCES:
patent: 4394580 (1983-07-01), Gielisse
patent: 4845646 (1989-07-01), Marquis et al.
patent: 5351117 (1994-09-01), Stewart et al.
patent: 5835205 (1998-11-01), Hunter et al.
Hofsass Jeffery A.
Nguyen Tai T.
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