Workpiece with machine-readable marking recessed therein and method of making same
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United States of America Patent
Stats
-
Apr 27, 1982
Grant Date -
N/A
app pub date -
Sep 24, 1979
filing date -
Sep 24, 1979
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A workpiece having a machine-readable coded marking recessed into the surface thereof. The workpiece 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 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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Cited Art Landscape
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