Lighting system for illuminating billboards and the like
US4954935A · kind A · utility
17Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 8, 1989 |
| Grant date | Sep 4, 1990 |
| Priority date | — |
| Expiry date | Feb 8, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S362/812
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A new and improved lighting system for illuminating signs such as billboards and the like which increases the amount of light illuminating the light from a light source by 15 to 20% as compared with previous systems and decreases the variance of illumination intensity by 50%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.