Patent · US Active

Grading lamp for gemstones

US10352868B2 · kind B2 · utility

1Cited by

13References

18Claims

0Family size

Assignee

Sy Kessler Sales, Inc. · US

Inventors

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

Key dates

Filing date	Jun 29, 2017
Grant date	Jul 16, 2019
Priority date	—
Expiry date	Jun 29, 2037

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/8806
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A grading lamp for gemstones is disclosed. In one embodiment, the grading lamp includes a base having an open top with a bottom wall bounded by upstanding front, rear, and side walls, and a lid hinged to the rear wall for swinging between open, intermediate, and closed positions relative to the base. The lid includes an interior lamp recess having natural and ultraviolet lights behind a light diffusing filter. A tray within the open top of the base holds color reference stones and a gem under examination. In the intermediate position, the grading lamp mitigates outside ambient light and provides direct light from either the natural or ultraviolet lights.

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