Registers – Records
Patent
1987-10-29
1988-12-13
Pitts, Harold I.
Registers
Records
235488, G06K 1902
Patent
active
047912847
ABSTRACT:
To etch a bar code on a metal surface, a sheet of transfer material having an adhesive layer of negative-acting photosensitive substance is exposed through a positive of the desired bar code. After development, the adhesive layer provides an etching mask having apertures which correspond in position and shape to the bars of the positive. The mask is sealingly affixed to the metal surface. The metal is then electrochemically etched through the apertures in the mask to provide tough, black bars which remain after the mask is removed. Since the mask adheres to the metal surface, etchant seepage at the edges of the apertures does not occur, which improves the readability of the bar code etched onto the surface.
REFERENCES:
patent: 4085314 (1978-04-01), Schultz
patent: 4327283 (1982-04-01), Heyman et al.
patent: 4446362 (1984-05-01), Heyman
Marking Methods, Inc. Publication, "What is Electrochemical Etching?", (1986) pp. 1-4 and 12.
Instruction Sheet entitled "I.N.T./Image 'n Transfer", (un-dated) 1 page.
Publication of GC Electronics, "P.T.S. Positive Transfer System Printed Circuit Board Making System", (un-dated) 2 pages.
Advertisement of Monode Marking Products, Inc., (un-dated) three pages.
Advertisement of Lectroetch Company, (un-dated), three pages.
Lectroetch Company Publication, "Electrochemical Marking Manual", (1971) pp. 1-21.
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