Process for making silicone containing hydrogel lenses
US5260000A · kind A · utility
325Cited by
20References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 3, 1992 |
| Grant date | Nov 9, 1993 |
| Priority date | — |
| Expiry date | Aug 3, 2012 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0041
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing silicone hydrogel contact lenses where machining operations are employed to produce a lens having a desired final shape. The silicone hydrogel contact lenses are prepared by: providing a monomeric mixture comprising a silicone-containing monomer, a hydrophilic monomer and an organic diluent; charging the mixture to a mold and curing the formulation in the mold to obtain a shaped article; removing organic diluent from the shaped article to improve machineability of the article; and machining the shaped article to obtain a contact lens having a desired configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.