Transparent instrument cover and instrument incorporating same
US4181925A · kind A · utility
18Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 1977 |
| Grant date | Jan 1, 1980 |
| Priority date | — |
| Expiry date | Jul 18, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D11/28
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transparent instrument cover provided with an electroluminescent area arranged so that when energized, light is projected from one surface of the cover to illuminate a dial of an instrument on which it is fitted. The cover is intended as a replacement for an existing transparent cover or coverglass in an instrument. In a first embodiment the electroluminescent area is an annular area located adjacent the periphery of the cover, and in a second embodiment an isolated electroluminescent area is located within the annular area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.