Transparency viewer
US4530570A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 7, 1983 |
| Grant date | Jul 23, 1985 |
| Priority date | — |
| Expiry date | Apr 7, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/024
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device is adapted for viewing transparencies disposed circumferentially on a disk. It comprises a case (10) adapted to contain a disk (12). A pin (15) is adapted to mount the disk (12) for rotation within the case (10). The disk (12) may be driven in rotation by virtue of at least one peripheral opening (10F, 10G) in the case (10). A pair of windows (10C, 10D) are disposed in face to face relationship and so that the transparencies (13) can move between them. A front member (11B) on one side of the windows is adapted to support an optical system comprising at least one lens (15) in line with and spaced from the windows. A rear member (11C) is adapted to constitute a shank for clipping the device to an article of clothing. The device may be used and worn as a badge, since the front surface of the case (10) may carry any form of inscription or illustration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.