Method for adding a thermoset overmold layer to a lens within a mold
US7820082B2 · kind B2 · utility
5Cited by
13References
32Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2007 |
| Grant date | Oct 26, 2010 |
| Priority date | — |
| Expiry date | Apr 19, 2028 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0033
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and coating used to prepare a photochromically-enabled bifocal ophthalmic lens. The method and equipment includes injection molding a single vision lens, for example, from polycarbonate. The clamp opens vertically and the top insert is exchanged for a bifocal mold having a base curve similar to the single vision lens. The thermoset coating includes compounds from several acrylate classes, and is applied to the single vision lens. The coating may include a photochromic dye. The coating is also formulated to receive a photochromic solution through an imbibition process.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.