Radiation imagery chemistry: process – composition – or product th – Imaging affecting physical property of radiation sensitive... – Readily visible image formation
Reexamination Certificate
2006-12-12
2006-12-12
McPherson, John A. (Department: 1756)
Radiation imagery chemistry: process, composition, or product th
Imaging affecting physical property of radiation sensitive...
Readily visible image formation
C430S330000, C216S032000
Reexamination Certificate
active
07147990
ABSTRACT:
Photographic engraving procedure with high definition on metal, covering the stages of: obtaining a photographic positive or negative of the image to be reproduced in the engraving, cleaning, de-greasing, polishing and shining of the metal surface where the engraving is to be made, impregnation of the surface with photosensitive emulsion, making contact between the photographic positive or negative with the surface to be engraved, using a press, exposure to actinic light, developing of the emulsion, attack of the metal with salts or acids on the areas unprotected by emulsion during the development action, stripping of the protective emulsion and cleaning of the remains of salts or acids, and application of a protective layer of transparent enamel.
REFERENCES:
patent: 5920977 (1999-07-01), Wyckoff et al.
patent: 2004/0007558 (2004-01-01), Sim
Collard & Roe P.C.
McPherson John A.
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