Multifocal optical elements
US5757459A · kind A · utility
63Cited by
26References
37Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 1995 |
| Grant date | May 26, 1998 |
| Priority date | — |
| Expiry date | May 31, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31504
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A multi-focal lens with both a power portion and a functional portion where the power portion imparts a majority of the optical power and magnification characteristics to the multi-focal lens and has a front side with both a main focal surface and a secondary focal surface that is recessed relative to the main focal surface and where the functional portion has a rear side that is shaped like the front side of the power portion with the rear side of the functional portion being affixed to the front side of the power portion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.