Illuminated sign system
US4848016A · kind A · utility
4Cited by
6References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 28, 1987 |
| Grant date | Jul 18, 1989 |
| Priority date | — |
| Expiry date | Sep 28, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F13/0454
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Existing illuminated signs required skilled workers to replace or change the sign face. The present sign system allows the illuminated faces to be rapidly and easily changed by non-skilled workers. Transparent or translucent plastic envelopes are used to support color transparencies which form the sign faces. The envelopes are easily slipped into and out of the display position. The sign system is particularly suited for use as point-of-purchase advertising in grocery store aisle markers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.