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1. (WO1998052773) MARKING DIAMOND
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/052773 International Application No.: PCT/GB1998/001493
Publication Date: 26.11.1998 International Filing Date: 22.05.1998
Chapter 2 Demand Filed: 21.12.1998
IPC:
B28D 5/00 (2006.01) ,B44B 7/00 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
28
WORKING CEMENT, CLAY, OR STONE
D
WORKING STONE OR STONE-LIKE MATERIALS
5
Fine working of gems, jewels, crystals, e.g. of semiconductor material; Apparatus therefor
B PERFORMING OPERATIONS; TRANSPORTING
44
DECORATIVE ARTS
B
MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING OR INLAYING
7
Machines, apparatus, or hand tools for branding
Applicants:
GERSAN ESTABLISHMENT [LI/LI]; Aeulestrasse 5 FL-9490 Vaduz, LI (AllExceptUS)
SMITH, James, Gordon, Charters [GB/GB]; GB (UsOnly)
GUY, Keith, Barry [GB/GB]; GB (UsOnly)
POWELL, Graham, Ralph [GB/GB]; GB (UsOnly)
GAUKROGER, Michael, Peter [GB/GB]; GB (UsOnly)
Inventors:
SMITH, James, Gordon, Charters; GB
GUY, Keith, Barry; GB
POWELL, Graham, Ralph; GB
GAUKROGER, Michael, Peter; GB
Agent:
WALDREN, Robin, Michael; Marks & Clerk 57-60 Lincoln's Inn Fields London WC2A 3LS, GB
Priority Data:
9710736.123.05.1997GB
Title (EN) MARKING DIAMOND
(FR) PROCEDE DE GRAVURE SUR DIAMANT
Abstract:
(EN) In order to provide an invisible information mark on a facet of a diamond gemstone, a plasma resist is applied to the whole of the exposed surface of the gemstone, a layer of gold is applied to the facet in the region where the mark is to be formed, a selected zone of the metal and resist layers is ablated by ultraviolet laser ablation to form a mask on the facet, an electrical connection is provided to the metal layer, and the facet is plasma etched through the mask in order to apply a mark of appropriate depth, the resist and metal layers subsequently being removed.
(FR) Afin de réaliser une gravure indicative invisible sur l'une des facettes d'un diamant, on applique un résist à plasma sur toute la surface exposée de ce diamant, avant d'appliquer une couche d'or sur ladite facette, à l'endroit où la gravure est destinée à être réalisée. On choisit une zone des couches de métal et de résist pour à traiter par ablation au laser ultraviolet, afin de former un masque sur la facette, une liaison électrique étant ménagée sur la couche de métal. Cette facette est ensuite soumise à une attaque au plasma afin de réaliser, à travers le masque, une gravure de profondeur adéquate, les couches de résist et de métal étant retirées ultérieurement.
Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, US, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
KR1020010012915ZA1998/04375IL124591EP0983152RU02198099US6358427
JP2001526571 CN1264341CA2291042DE000069804957GB2325439GB2339726
AU1998075408IN1096/MAS/1998