Multifocal birefringent lens system
US4981342A · kind A · utility
187Cited by
6References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 1, 1988 |
| Grant date | Jan 1, 1991 |
| Priority date | — |
| Expiry date | Aug 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/22
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A multifocal birefringent lens system is described together with applications of the lens system such as ophthalmic lenses (including those of the intraocular, contact and spectacle type) and optical instruments and devices including photographic cameras, telescopes, microscopes, copiers, spectrographic instruments, etc.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.