Workpiece with machine-readable marking recessed therein and met

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

1979-09-24

1982-04-27

Kilgore, Robert M.

Registers

Records

235488, G06K 1902

Patent

active

043272835

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.

REFERENCES:
patent: 3702585 (1972-11-01), Landis
patent: 3726212 (1973-04-01), Combs
patent: 3736406 (1973-05-01), Vossen
patent: 3761725 (1973-09-01), Meyer
patent: 3792238 (1974-02-01), Samoel
patent: 3820456 (1974-06-01), Wolfheimer
patent: 3839644 (1974-10-01), Fulton
patent: 3903526 (1975-09-01), Cotter
patent: 4038524 (1977-07-01), Puech et al.
patent: 4085314 (1978-04-01), Schultz et al.

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