Document with indexes
US7971789B2 · kind B2 · utility
1Cited by
3References
22Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 1, 2008 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Dec 1, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06037
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A document with indexes is constructed by printing plural pixels and divided into plural areas. Each of the areas has plural indexes respectively consisting of a group of indexing dots to represent an area code corresponding to the area. The indexes and the pixels have different optical reflection features.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.