Method for transiently wetting lens molds in production of contact lens blanks to reduce lens hole defects
US5674557A · kind A · utility
30Cited by
5References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Oct 7, 1997 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2995/0092
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Hydrophilic contact lens molds are transiently modified to provide a water dynamic contact angle equal to or less than 100.degree. by treatment with a wetting agent which may be water or a surfactant composition which provides a mold surface having a water wetting force of at least 70 mg to afford a reduction in lens hole defects in hydrophilic contact lens manufacture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.