Patent · US Active

Gem tester

US8749253B2 · kind B2 · utility

12Cited by

16References

18Claims

0Family size

Assignee

Sy Kessler Sales, Inc. · US

Inventors

Daniel L. Kessler · Dallas, US
Henry M. Kessler · Dallas, US

Key dates

Filing date	Oct 21, 2013
Grant date	Jun 10, 2014
Priority date	—
Expiry date	Oct 21, 2033

Classification

Technology area (CPC G)Physics
CPC primaryG01N33/24
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A gem tester for testing a gem under test and a kit including a horizontal recharging stand are disclosed. In one embodiment of the gem tester, an elongated body has a line-of-sight contour tapering from a bulbous end to a radially deviating frontal nose having a probe extending therefrom. Internal circuitry measures electrical and thermal conductivity of the gem under test in order to identify the type of gem under test and drive a color control signal in response thereto. A luminescent mounting extends about the contact to provide, in response to the control signal, a color indication of the identified gem type.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.