High adhesion acrylate coating for a photochromic ophthalmic lens
US7759433B2 · kind B2 · utility
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12References
18Claims
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Key dates
| Filing date | Jun 20, 2007 |
| Grant date | Jul 20, 2010 |
| Priority date | — |
| Expiry date | Feb 16, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2475/16
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and coating used to prepare a photochromically-enabled bifocal ophthalmic lens. The coating is a high adhesive strength acrylate-based coating that contains a small quantity of a polycarbonate-based TPU. The coating is applied to produce an intermediate imbibable bifocal surface. A photochromic solution is subsequently imbibed by contact with the bifocal surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.