Illuminated transparency viewing system with overlay device and film clips
US4385462A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1979 |
| Grant date | May 31, 1983 |
| Priority date | — |
| Expiry date | Aug 6, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F1/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A transparency viewing system employs an illuminated viewer adapted to be used with an overlay device and/or film retaining clips. Brackets are provided to define longitudinal open channels at opposite edges of the illuminated viewing surface. The overlay device is of a size to span the viewing surface such that the marginal edges thereof, which have a configuration similar to that of the open channels, may be inserted into the open channels so that the overlay device is held against the viewing surface. Each retaining clip includes a mounting portion having a configuration similar to that of the channels and may be adjustably positioned along the channels so that its operating portion is biased against the viewing surface to hold transparencies placed between the clip and the viewing surface in position. The brackets are secured to the housing at respective opposite edges to fix the viewing surface in place at the upper edge thereof and has a depending portion extending inwardly from the edges of the viewing surface to overlie the viewing surface so that the channel side walls are defined by the viewing surface and the bracket depending portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.