Silicone hydrogel contact lenses
US9625616B2 · kind B2 · utility
4Cited by
2References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 14, 2014 |
| Grant date | Apr 18, 2017 |
| Priority date | — |
| Expiry date | Mar 14, 2034 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L83/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method is provided for manufacturing ophthalmically-acceptable, distortion-free silicone hydrogel contact lenses without the use of volatile organic solvents in the manufacturing process. The contact lenses are extract with an extraction liquid comprising an aqueous solution of a non-volatile organic solvent, such as ethyl lactate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.