Directory sign mask
US4653209A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 25, 1984 |
| Grant date | Mar 31, 1987 |
| Priority date | — |
| Expiry date | Oct 25, 2004 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F7/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A mask and mask assembly for use in a directory sign or the like. One or more masks are affixed to a backing panel, thereby defining a number of adjacent parallel channels for removably receiving message strips in the form of transparencies or the like. The mask comprises a substantially plane sheet member preferably flat on the front side, and on the back side having a number of raised lands longitudinally extending along the mask. The lands are laterally spaced apart from each other, and this facing defines the channels for receiving message strips. The masks have complementary overlapping lateral edges, so that a number of masks can be aligned side-to-side on a backing panel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.