Method and apparatus for producing characters on a grit-erodible

Details Method and apparatus for producing characters on a grit-erodible Method and apparatus for producing characters on a grit-erodible

1983-11-07

1987-12-29

Kittle, John E.

Radiation imagery chemistry: process, composition, or product th

Imaging affecting physical property of radiation sensitive...

Forming nonplanar surface

430325, 430327, 430329, 51262R, 51311, 51312, G03C 500

Patent

active

047160969

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.

REFERENCES:
patent: 1954672 (1934-04-01), Kavanaugh
patent: 2292996 (1942-08-01), Helgeson
patent: 3579926 (1971-05-01), Gaspari
patent: 3808751 (1974-05-01), Usui

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