Optical encoding
US7074478B2 · kind B2 · utility
15Cited by
9References
9Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 21, 2001 |
| Grant date | Jul 11, 2006 |
| Priority date | — |
| Expiry date | Aug 31, 2022 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24917
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A substrate, such as a document of value, carries a design feature (F), which includes an array of repeating patterns with the patterns exhibiting discrete differences in one or more visual characteristics, for example, shape, color or optical responses, according to a predetermined pattern. The differences are, preferably, indiscernible to the unaided eye, but can be discriminated by an optical reading machine. In an alternatively preferred embodiment, the visual characteristics of each pattern represent 8- or 16-bit information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.