B - Operations – Transporting – 44 – B
Patent
B - Operations, Transporting
44
B
B44B 7/00 (2006.01) A44C 17/00 (2006.01) B28D 5/00 (2006.01) B44B 5/00 (2006.01) B44C 1/22 (2006.01) H01J 37/305 (2006.01)
Patent
CA 2291041
An information mark invisible to the naked eye is applied to the polished facet of a diamond gemstone by coating the diamond gemstone surface with an electrically conductive layer so as to prevent the diamond becoming charged, forming the mark with a focused ion beam, and cleaning the diamond surface with a powerful oxidizing agent to reveal a mark having an appropriate depth, which does not detrimentally affect the clarity or colour grade of the diamond.
On forme une gravure indicative, invisible à l'oeil nu, sur la facette polie d'un diamant, en revêtant la surface de ce diamant d'une couche électriquement conductrice, de manière à prévenir tout chargement dudit diamant, puis en gravant au moyen d'un faisceau électronique focalisé, et en nettoyant la surface du diamant au moyen d'un agent fortement oxydant, afin de révéler ladite gravure, de profondeur adéquate, qui ne nuit pas au degré de pureté ou à la couleur dudit diamant.
Smith James Gordon Charters
Stewart Andrew David Garry
de Beers Centenary Ag
Gersan Establishment
Marks & Clerk
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