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:
Jul. 09, 2019
Filed:
Aug. 21, 2018
Applicant:
DE Beers Uk Ltd, London, Greater London, GB;
Inventors:
James Gordon Charters Smith, Buckinghamshire, GB;
Colin McGuinness, Berkshire, GB;
David Fisher, Berkshire, GB;
Assignee:
De Beers UK Ltd, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N 21/87 (2006.01); G01N 21/64 (2006.01);
U.S. Cl.
CPC ...
G01N 21/87 (2013.01); G01N 21/64 (2013.01);
Abstract
A method of and an apparatus for providing an indicator for a diamond as to whether it is natural by testing for the presence or absence of one or more specific markers in the luminescence properties of the diamond, These markers are characterized by luminescence decay time and luminescence wavelength.