Non-electronic character display
US4220948A · kind A · utility
15Cited by
4References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 12, 1978 |
| Grant date | Sep 2, 1980 |
| Priority date | — |
| Expiry date | Oct 12, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F9/37
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A sign board comprises an opaque front plate interfacing with a translucent or reflective back plate. Slots in the front plate define the segments of 7-segment characters. Shutters are slideable within the interface to selectively open and close slots for defining individual characters. Means are provided for retaining the shutters in open and closed positions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.