Granted Patents

Printing color images visible under UV light on security documents and valuable articles

R.D. Hersch; P.Donzé; S. Chosson
U.S. Patent No. 8085438
Abstract Full paper: Full Text

Synthesis of superposition images for watches, valuable articles and publicity

R.D. Hersch; S. Chosson
U.S. Patent No. 7,295,717
Abstract Full paper: Full Text

Authentication of secure items by shape level lines

S. Chosson; R.D. Hersch
U.S. Patent No. 7,305,105
Abstract Full paper: Full Text

Model-based synthesis of band moire images for authenticating security documents and valuable products

R.D. Hersch; S. Chosson
U.S. Patent No. 7,751,608
Abstract Full paper: Full Text

Authentication of documents and articles by moire patterns

R.D. Hersch; S. Chosson
U.S. Patent No. 7,194,105
Abstract Full paper: Full Text

Authentication with built-in encryption by using moire intensity profiles between random layers

I.Amidror
U.S. Patent No. 7,058,202
Abstract Full paper: Full Text

Method and Apparatus for Generating Digital Halftone Images by Using Multi Color Dithering

V. Ostromoukhov, R.D. Hersch
U.S. Patent No. 7,054,038
Abstract Full paper: Full Text

Images incorporating microstructures

R.D.Hersch et al.
U.S. Patent No. 7,027,660
Abstract Full paper: Full Text

Authentication of documents and valuable particles by using moire intensity profiles

I.Amidror, R.D.Hersch
U.S. Patent No. 6,819,775
Abstract Full paper: Full Text

Method and apparatus for authentication of documents by using the intensity profile of moire patterns

Isaac Amidror, Roger D. Hersch
U.S. Patent No. 6,249,588
Abstract Full paper: Full Text

Method and apparatus for generating halftone images by evolutionary screen dot contours

V.Ostromoukhov, R.D.Hersch
U.S. Patent No. 6,198,545
Abstract Full paper: Full Text

Methods and apparatus for authentication of documents by using the intensity profile of moire patterns

Isaac Amidror, Roger D. Hersch
U.S. Patent No. 5,995,638
Abstract Full paper: Full Text

Method for generating a security document

Roger D. Hersch; Nicolas Rudaz
E.P. 1073257A1
Abstract Full paper: Full Text

Method for producing contrast-controlled grayscale characters

Roger D. Hersch, Claude Bétrisey, Justin Bur
U.S. Patent No. 5,796,409
Abstract Full paper: Full Text

Method for producing visually evenly spaced typographic characters

Roger D. Hersch, Claude Bétrisey
U.S. Patent No. 5,768,490
Abstract Full paper: Full Text

Method and apparatus for a parallel data storage and processing server

Roger D. Hersch, Bernard Krummenacher
U.S. Patent No. 5,737,549
Abstract Full paper: Full Text

Method and Apparatus for Generating Digital Half-tone Images Using a Rotated Dispersed Dither Matrix.

Victor Ostromoukhov
U.S. Patent No. 5,438,431
Abstract Full paper: Full Text

Method and Apparatus for Generating Halftone Images by Discrete One-to-one Dither Tile Rotation

V.Ostromoukhov, R.D.Hersch
U.S. Patent No. 5,422,742
Abstract Full paper: Full Text