Display board
US4251936A · kind A · utility
13Cited by
10References
4Claims
0Family size
Inventor
Key dates
| Filing date | Jul 31, 1978 |
| Grant date | Feb 24, 1981 |
| Priority date | — |
| Expiry date | Jul 31, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F7/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display unit is disclosed in which a frame assembly magnetically supports a plurality of removable display strips in predetermined patterns and in which alpha-numeric character elements are magnetically supported on the display strips and frame assembly in information displaying sets referenced in part by markings located on the surface of the display strips.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.