Low oxygen molding of soft contact lenses
US5753150A · kind A · utility
62Cited by
21References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 6, 1997 |
| Grant date | May 19, 1998 |
| Priority date | — |
| Expiry date | Mar 6, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/757
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for providing degassed complementary concave and convex lens molds to filling and mold assembly stations in a continuous or semicontinuous automated soft contact lens manufacturing system. The process includes injection molding the lens molds, immediately transferring the lens molds to an inert gas atmosphere, degassing the lens molds, and filling the lens molds with a polymerizable monomer under the inert gas prior to mold assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.