Light box
US4766685A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 1986 |
| Grant date | Aug 30, 1988 |
| Priority date | — |
| Expiry date | Mar 10, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/024
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An illuminated sign. The illuminated sign comprises a cabinet with internal illumination, a diffusion plate, a transparent plate, and a retention strip with an associated camming strip. The cabinet is provided with an internally facing, circumferential support flange, and a forwardly facing circumferential retention channel with longitudinal grooves therein. In use, the diffusion and transparent plates (with indicia held therebetween) is releasably held on the support flange by the retention strip. Accidental removal of the retention strip is prevented by the interaction of the retention strip and the camming strip within the retention channel. This arrangement permits indicia to be quickly and easily changed from the front of the illuminated sign.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.