Inventors:
Robert L. Daigneault - Longmeadow MA
Michael F. Koenig - Goshen NY
Otto Ondruska - Erie PA
Daniel R. Rogers - Erie PA
Jiyue Yang - Towaco NJ
Assignee:
International Paper Company - Purchase NY
International Classification:
B41J 201
Abstract:
A method and an apparatus for applying chemical watermarks to a substrate, e. g. , paper, using a digital printer which prints ink in a dot matrix pattern. The ink may contain either a translucentizing agent or an opacifying agent. The printer is digitally controlled to print ink in accordance with a computer program corresponding to a desired pattern or image.