Exit sign
US5018290A · kind A · utility
65Cited by
16References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 23, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Feb 23, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/812
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In an exit sign, a plurality of rugged low voltage incandescent lamps are mounted on a printed circuit board to provide proper illumination. The lamps are positioned to provide indirect illumination to the "EXIT" stencilling of the exit sign. The exit sign can be adapted for use with both low voltage alternating current and low voltage emergency direct current. Because the lamps are driven at low voltage and are resistant to failure due to vibration, etc., they can be expected to attain a long life in service.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.