Display sign
US4045895A · kind A · utility
4Cited by
6References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 26, 1976 |
| Grant date | Sep 6, 1977 |
| Priority date | — |
| Expiry date | Jul 26, 1996 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/06
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display sign of the type comprising a back-lighted panel having a plurality of discrete light-transmitting areas and controlled opaque discs which selectively overlie the individual light-transmitting areas to produce a desired visual pattern of light transmitted through the panel. The improvement comprises discrete projections for supporting the individual discs. The arrangement of projections serves as structural reinforcement in the panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.