Changeable sign board with magnetic characters
US4583312A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1983 |
| Grant date | Apr 22, 1986 |
| Priority date | — |
| Expiry date | Jul 18, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F7/04
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A changeable sign includes a flat magnetizable sheet metal sign board, and a plurality of trapezoidal segments of magnetic sheet material sized and arranged to form segmented alphanumeric characters magnetically adhered to the board. The board also includes space to apply a sheet of magnetic material containing printed information. Semi-invisible guidelines on the board, such as glossy lines on a flat background of the same color, guide the positioning of the segments to form the characters. The segments are formed with non-acute angle corners to maximize adherence at their corners. The segments are rearranged to form different characters and can be repositioned at will on the sign board over the guidelines to completely alter the sign format.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.