Title:
複数の溝によるダイアモンド若しくは宝石用原石のマーキング
Document Type and Number:
Japanese Patent JP4497720
Kind Code:
B2
Abstract:
The surface of a diamond gemstone is marked with an alphanumeric character in the form of parallel grooves 10 using a focussed ion beam (eg gallium), excimer laser or plasma etching. The mark cannot be read with the naked eye, the grooves producing a visible diffraction effect such that the mark can be read under magnification. The marked diamond 104 may be viewed using a microscope when illuminated by two directional light sources 106 at an angle corresponding to the angle of diffraction.
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Inventors:
Smith, James Gordon Charters
Application Number:
JP2000526381A
Publication Date:
July 07, 2010
Filing Date:
December 23, 1998
Export Citation:
Assignee:
Gerzan Establishment
International Classes:
A44C27/00; B44B7/00; B44C1/22; G02B21/00; G09F19/12
Domestic Patent References:
| JP9225659A | ||||
| JP7108007A | ||||
| JP4193406A | ||||
| JP2000501652A | ||||
| JP10244382A | ||||
| JP5094615A | ||||
| JP56108712U |
Foreign References:
| WO1998052774A1 |
Attorney, Agent or Firm:
Tadahiko Ito
Shinsuke Onuki
Tadashige Ito
Shinsuke Onuki
Tadashige Ito