Title:
【発明の名称】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 JP2001526996
Kind Code:
A
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.
Inventors:
Smith, James Gordon Charters
Application Number:
JP2000526381A
Publication Date:
December 25, 2001
Filing Date:
December 23, 1998
Export Citation:
Assignee:
Gerzan Establishment
International Classes:
B44B7/00; B44C1/22; G02B21/00; A44C27/00; G09F19/12; (IPC1-7): B44C1/22; A44C27/00; G09F19/12
Domestic Patent References:
| JP2000501652A | 2000-02-15 | |||
| JPH09225659A | 1997-09-02 | |||
| JPH07108007A | 1995-04-25 | |||
| JPH04193406A | 1992-07-13 | |||
| JPH10244382A | 1998-09-14 | |||
| JPH0594615A | 1993-04-16 | |||
| JPS56108712U | 1981-08-24 |
Foreign References:
| WO1998052774A1 | 1998-11-26 |
Attorney, Agent or Firm:
Tadahiko Ito