Alternating sign
US8245424B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2008 |
| Grant date | Aug 21, 2012 |
| Priority date | — |
| Expiry date | Jun 13, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/12
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An alternating sign assembly includes a sheet of light permeable material comprising a front surface and a rear surface; a front design that includes a front design layer; a silhouette pattern including light-restricting imaging material, said front design being superimposed on or forming a part of the silhouette pattern, said silhouette pattern subdividing said sheet into a plurality of discrete areas of said imaging material and/or a plurality of discrete areas devoid of said imaging material; a switchable front source of artificial illumination of said front design; a rear design disposed rearwardly of the front design; and a switchable rear source of artificial illumination of said rear design. The sources of illumination may be alternately turned on to make the front and rear designs alternately visible to an observer in front of the assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.