The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 2026
Filed:
Jan. 06, 2021
Applicant:
DE Beers Uk Ltd, London, GB;
Inventors:
Peter Lanigan, Berkshire, GB;
Colin Mcguinness, London, GB;
Assignee:
De Beers UK Ltd, London, GB;
Primary Examiner:
Int. Cl.
CPC ...
G01N 21/64 (2006.01); G01N 21/87 (2006.01);
U.S. Cl.
CPC ...
G01N 21/64 (2013.01); G01N 21/87 (2013.01);
Abstract
A method of determining the composition of a polished gemstone includes passing an excitation beam through the gemstone from a table facet substantially to a culet of the gemstone, an axis of the excitation beam being substantially perpendicular to the table facet; and capturing luminescence emitted by the gemstone from an angle oblique to the axis of the excitation beam.