Stand magnifier and lens
US4944574A · kind A · utility
12Cited by
15References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 28, 1988 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Jan 28, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/02
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The invention discloses a bi-convex lens having aspheric surfaces, each of substantially identical curvature. The lens may be used in a stand magnifier which comprises a stand adapted to be supported on a surface and to which is attached or attachable such a magnifying lens. At least part of the stand and the lens is tiltable with respect to the surface in either direction from a position where the lens is parallel to the surface, preferably through an angle of up to 20.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.