Recursive-reflective display devices
US7248169B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 8, 2003 |
| Grant date | Jul 24, 2007 |
| Priority date | — |
| Expiry date | Feb 24, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/0088
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
In a retroreflective display device comprising at least a surface-protective layer, information display layer, retroreflective layer and a back-protective layer, on or between these layers radio frequency identification unit or units enclosing radio frequency identification integrated circuit or circuits are disposed, and communication antenna or antennas which are connected to said radio frequency identification integrated circuit or circuits are installed. At the back of the retroreflective layer an illuminator is disposed. The retroreflective layer is retroreflective to the light coming from the front of the sign and is transmissive to the light from the interior of the sign.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.