Extension platform to support transparencies for an overhead projector
US4498746A · kind A · utility
3Cited by
2References
9Claims
0Family size
Inventor
Key dates
| Filing date | Oct 7, 1983 |
| Grant date | Feb 12, 1985 |
| Priority date | — |
| Expiry date | Oct 7, 2003 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S353/05
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An extension platform for holding a book of transparencies in an operative position on an overhead projector includes a body member adapted to receive and hold a pack of transparencies, at least two suction cups positioned on the underside of the body member for attaching and securing the body member to the stage area of an overhead projector and wedge-shaped fulcrum means located under the body member which translates the downward gravitational force of the weight of the pack of transparencies into an upward pull on the suction cups. In another embodiment, the extension platform is attached to part of a book of transparencies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.