Headlight lens with external light sensitivity
US5228767A · kind A · utility
4Cited by
9References
2Claims
0Family size
Inventor
Key dates
| Filing date | Mar 24, 1992 |
| Grant date | Jul 20, 1993 |
| Priority date | — |
| Expiry date | Mar 24, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21S41/323
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A headlight lens is fabricated from photochromic glass so that the headlight is not noticeable during daylight hours when subjected to ultraviolet light. At night, in the absence of ultraviolet light, the lens is transparent and emits the light from inside the headlight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.