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1. (WO1984002108) METHOD OF AND APPARATUS FOR TREATING PRINTED PAPER

Pub. No.:    WO/1984/002108    International Application No.:    PCT/US1983/001903
Publication Date: Jun 7, 1984 International Filing Date: Dec 2, 1983
IPC: B41F 17/02
B41M 3/14
B41M 7/00
B65H 45/101
Applicants:
Inventors:
Title: METHOD OF AND APPARATUS FOR TREATING PRINTED PAPER
Abstract:
In a method of and apparatus for rendering subject matter which is printed on one surface of a paper sheet (11a) unintelligible, an alpha-numeric interference pattern (Fig. 7) is printed over substantially the entire printing area of the surface of the sheet (11a) carrying the printed subject matter, the density of the interference pattern (Fig. 7) being sufficient to render the printed subject matter unintelligible. One particular use of the method is in the overprinting of computer print-out paper having printed information on one surface, so that the paper may be reused by printing on its opposite surface without permitting access to the information on the first-printed surface. A machine (10) is disclosed for this application of the method.