Workpiece with machine-readable marking recessed therein and...

Details Workpiece with machine-readable marking recessed therein and... Workpiece with machine-readable marking recessed therein and...

G - Physics

06

K

354/56

G06K 9/00 (2006.01) B24C 1/04 (2006.01) H01J 9/00 (2006.01)

Patent

CA 1153117

RCA 73,880 Abstract A workpiece having a machine-readable coded marking recessed into the surface thereof comprises a main body and a thin integral coating in the area of the marking. The marking comprises a plurality of related marks, such as in a bar-code marking, which are recessed through the coating and which have substantially different light reflectances than the surrounding surface. The workpiece may include an integral undercoating between the coating and the main body with marks recessed into, but not through, the undercoating. The marks may be made by selectively removing material, as by abrasion or ablation, from defined surface areas and through the coating.

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