Lens for low light level lamp
US4975816A · kind A · utility
3Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1989 |
| Grant date | Dec 4, 1990 |
| Priority date | — |
| Expiry date | Aug 11, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21V5/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lens for use in a stand alone lamp utilizing low wattage light bulbs. The lamp is powered through the utilization of photovoltaic cells which charge a battery which then provides power to the bulb in the absence of the sun. The lens is constructed of a hollow body having horizontally disposed ribs formed on the exterior surface thereof with a clear, unobstructed lower portion closing the bottom of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.