Invention Grant
- Patent Title: Multi-tonal copy evident document methods and products
- Patent Title (中): 多色调复印方式和产品明显
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Application No.: US12415893Application Date: 2009-03-31
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Publication No.: US08355179B2Publication Date: 2013-01-15
- Inventor: Judy Wailing Wu
- Applicant: Judy Wailing Wu
- Agency: Grossman, Tucker, Perreault & Pfleger, PLLC
- Main IPC: H04N1/405
- IPC: H04N1/405 ; B41M3/14 ; B42D15/10

Abstract:
The present disclosure relates to a printed multi-tonal document with enhanced copy evident distortions security features and a method of printing such document. The document may include a multi-tonal background screen image area including a first set of halftone elements and a multi-tonal foreground hidden warning text and/or graphic screen image area including a second set of halftone elements, wherein the first set of halftone elements may be smaller in size than the second set of halftone elements. The multi-tonal foreground hidden warning text and/or graphic image area, when electronically copied, may appear different from the background of the copy of the document.
Public/Granted literature
- US20090244641A1 MULTI-TONAL COPY EVIDENT DOCUMENT METHODS AND PRODUCTS Public/Granted day:2009-10-01
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