Eugene B Elmlinger

US Patent:

41757742, Nov 27, 1979

Filed:

Mar 23, 1978

Appl. No.:

5/889229

Inventors:

Gerald A. Tonges - Sycamore Township, Hamilton County OH
Eugene L. Elmlinger - Springdale OH

Assignee:

American Standard Inc. - Cincinnati OH

International Classification:

B42D 1500

US Classification:

283 6

Abstract:

A document with a background printed thereon which includes a first portion formed of small dots and a second portion formed of larger dots. The larger dots are of a size which is reproduced by a copying machine. The small dots are of a size which is not reproduced by the copying machine. When a copy is made, only the larger dots reproduce so that the copy is readily distinguishable from the original.