Method for reducing lens hole defects in production of contact lens blanks
US5849222A · kind A · utility
108Cited by
1References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00192
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Improved homogeneity and uniformity of surface energy characteristics in a mold surface for hydrophilic contact lens production is achieved with the temporal application of a surface active agent such as Tween 80, to facilitate wetting of the optical surface of the mold, especially the convex mold, with the reactive monomer mix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.