Adhesive bonding and miscellaneous chemical manufacture – Delaminating processes adapted for specified product – Delaminating in preparation for post processing recycling step
Patent
1989-08-16
1991-01-15
Powell, William A.
Adhesive bonding and miscellaneous chemical manufacture
Delaminating processes adapted for specified product
Delaminating in preparation for post processing recycling step
65 31, 156657, 1566591, 156663, B44C 122, C03C 1500, C03C 2506
Patent
active
049851152
ABSTRACT:
A method is disclosed for etching glass surfaces, particularly the windows of vehicles, which includes the steps of preparing a graphic image including a bar code; transferring the image to a tissue stencil by means of a plurality of cylindrical rods; applying the stencil over a glass surface to be etched; applying an etchant in a defined pattern across the rear surface of the stencil; applying a nearly uniform pressure to the etchant to distribute the etchant over the rear surface of the stencil and to force it through the impressions in the stencil to etch the image onto the glass surface and removing the stencil and residue left on the surface being etched leaving the image etched in the surface of the glass. The etched image is read by a CCD scanner to recover the information represented by the bar code.
In its preferred form, this process further includes the step of coating the etched surface with a light reflective material which is subsequently removed from the non-etched portions of the glass but which remains in the etched portions to provide a light reflective image which can be read by a bar code reader directly into a computer.
REFERENCES:
patent: 4316766 (1982-02-01), Levin et al.
patent: 4401745 (1983-08-01), Nakane et al.
patent: 4460621 (1984-07-01), Pearlman
patent: 4585514 (1986-04-01), Scallan
patent: 4652337 (1987-03-01), Picone et al.
patent: 4657632 (1987-04-01), Holtzman
Bar Code Symbology-Some Observations on Theory and Practice (1984).
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