Roger D. Hersch
37Patents
16h-index
32Co-inventors
81Inventor score
Filing activity: Apr 6, 1993 → Jan 11, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5995638A | Methods and apparatus for authentication of documents by using the intensity profile of moire patterns | Physics | 106 | Expired |
| US7194105B2 | Authentication of documents and articles by moiré patterns | Physics | 84 | Expired |
| US6819775B2 | Authentication of documents and valuable articles by using moire intensity profiles | Physics | 54 | Expired |
| US6249588A | Method and apparatus for authentication of documents by using the intensity profile of moire patterns | Physics | 51 | Expired |
| US7027660B2 | Images incorporating microstructures | Performing Operations; Transporting | 41 | Expired |
| USRE38410E1 | Method and apparatus for a parallel data storage and processing server | General | 40 | Expired |
| US5737549A | Method and apparatus for a parallel data storage and processing server | Physics | 38 | Expired |
| US7751608B2 | Model-based synthesis of band moire images for authenticating security documents and valuable products | Physics | 36 | Active |
| US7054038B1 | Method and apparatus for generating digital halftone images by multi color dithering | Electricity | 27 | Expired |
| US7423778B2 | Prediction model for color separation, calibration and control of printers | Physics | 24 | Expired |
| US6198545A | Method and apparatus for generating halftone images by evolutionary screen dot contours | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5768490A | Method for producing visually evenly spaced typographic characters | Physics | 22 | Expired |
| US7252360B2 | Ink thickness variations for the control of color printers | Performing Operations; Transporting | 21 | Expired |
| US5422742A | Method and apparatus for generating halftone images by discrete one-to-one dither tile rotation | Electricity | 20 | Expired |
| US8085438B2 | Printing color images visible under UV light on security documents and valuable articles | Performing Operations; Transporting | 17 | Active |
| US7305105B2 | Authentication of secure items by shape level lines | Physics | 16 | Active |
| US9085190B2 | Synthesis of authenticable halftone images with non-luminescent halftones illuminated by an adjustable luminescent emissive layer | Performing Operations; Transporting | 13 | Active |
| US8610958B2 | Synthesis of authenticable color multi-halftone images | Electricity | 12 | Active |
| US5796409A | Method for producing contrast-controlled grayscale characters | Physics | 11 | Expired |
| US8351087B2 | Authentication with built-in encryption by using moire parallax effects between fixed correlated s-random layers | Performing Operations; Transporting | 10 | Active |
| US7491424B2 | Reproduction of security documents and color images with metallic inks | Emerging Cross-Sectional Technologies | 10 | Expired |
| US7710551B2 | Model-based synthesis of band moire images for authentication purposes | Physics | 10 | Active |
| US7295717B2 | Synthesis of superposition images for watches, valuable articles and publicity | Physics | 9 | Active |
| US8355169B2 | Synthesis of authenticable luminescent color halftone images | Physics | 8 | Active |
| US10628647B1 | Authentication and tracking by hidden codes | Physics | 7 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.