Downward viewing optical device
US5422759A · kind A · utility
6Cited by
2References
15Claims
0Family size
Inventor
Key dates
| Filing date | Dec 21, 1992 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/021
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical viewing apparatus adapted to be worn on the face which enables the wearer to view directly downward while maintaining an erect head and a horizontal line of sight.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.