Method and apparatus for producing characters on a grit-erodible body
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United States of America Patent
Stats
-
Dec 29, 1987
Issued Date -
N/A
app pub date -
Nov 7, 1983
filing date -
Jan 18, 1983
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for producing characters on a surface of a grit-erodible body are provided. A negative of the characters is first produced, usually photographically. Ultraviolet light is then directed through the negative onto a blasting mask blank comprising a backing sheet and a uniform layer of polymerizable material thereon. Light struck portions of the layer harden and the rest is washed away to produce the characters, and specifically a font of type. Selected characters are then positioned backward on a transfer sheet and transported to the surface of the body of grit-erodible material to which they are adhered, with the transfer sheet then peeled away. Blasting grit is then directed toward the surface to erode the grit-erodible material around the characters to a desired depth.
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