Surface casting onto a polycarbonate photochromic substrate
US8029707B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 7, 2006 |
| Grant date | Oct 4, 2011 |
| Priority date | — |
| Expiry date | Jul 18, 2026 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B3/10
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A system and method for providing photochromic segmented multifocal optical lenses. A latex primer formulation is provided for effectuating adhesion of a surface casting composition onto a lens having a photochromic coating. The method provides efficient, cost effective production of durable photochromic segmented lenses, via secure adhesion of a surface casting layer onto a photochromic substrate while maintaining desirable optical characteristics. A composite optical lens is advantageously formed having a photochromic base lens, a primer composition bonded to a convex surface of said base lens, and a cured casting composition bonded to said primer composition layer. The cured casting formulation includes a segment region to impart multifocal qualities onto the resultant composite optical lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.