Frame for transparency film
US4477991A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 24, 1981 |
| Grant date | Oct 23, 1984 |
| Priority date | — |
| Expiry date | Dec 24, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B21/64
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A unitary frame for mounting a film transparency having leading and trailing ends and spaced parallel sides which surround a picture area. The frame includes first and second members which are adapted for movement between a film transparency loading position and an operative position wherein they enclose and support the transparency. The frame includes, in the transparency loading position, a pair of laterally spaced open-ended guides for slidably receiving the parallel sides of the transparency as it is advanced into its proper relationship relative to the frame, and a pair of surfaces which extend forwardly of the open end of each of the guides and which function to direct the leading end of the transparency into the open end of each of the guides.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.