Registry device for transparencies for overhead projector
US4732468A · kind A · utility
4Cited by
15References
2Claims
0Family size
Inventor
Key dates
| Filing date | Jul 1, 1986 |
| Grant date | Mar 22, 1988 |
| Priority date | — |
| Expiry date | Jul 1, 2006 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S353/05
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A registry device for transparencies for an overhead projector comprises a backbone with at least two projections for entering openings in a transparency to prevent it from moving; and, an adhesive-free anchoring sheet of plastic attached to the backbone. The anchoring sheet being of a material that will cling to the glass stage of a projector and prevent the registry device from sliding or being moved until the anchoring sheet is lifted from the glass. In a preferred embodiment a framing sheet also is attached to the backbone.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.