Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-10-24
2006-10-24
Benson, Walter (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S687000
Reexamination Certificate
active
07126351
ABSTRACT:
Natural diamonds can be discerned from imitations, synthetic diamonds and treated diamonds on the basis of their physical qualities. Labs always test several specific characteristics in order to discern natural diamonds from others. One of the tested qualities is electrical conductivity. The invention concerns a method to establish the presence of electrical bulk conductivity. Use is made to this end of the fact that the proximity of an electrically conductive object (gemstone) has an influence on the parasitic capacity of a capacitive probe. The parasitic capacity is also influenced by the dielectric constant of the dielectric. The influence of the proximity of electrically conductive gemstones as opposed to non-conductive gemstones on the parasitic capacity is hereby larger than the influence of the differences in the dielectric constant of the gemstones.
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Benson Walter
Browdy and Neimark PLLC
Wetenschappelljk en Technisch Onderzoekscentrum voor Diamant Inr
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