Method of making a soft ophthalmic lens
US5395558A · kind A · utility
37Cited by
7References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 15, 1992 |
| Grant date | Mar 7, 1995 |
| Priority date | — |
| Expiry date | Dec 15, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for molding a soft ophthalmic lens mates a male and a female portion, one having around the periphery of the optical surface a knife edge and one containing a rim bushing peripherally exterior to the knife edge so that the knife edge deformably penetrates the other portion. Excess material is expelled from the mold cavity and separated from the lens by a region of prepolymer discontinuity defined by the rim bushing is produced by using a cylindrical insert and an annular sleeve machined to have the rim bushing on the surface of one end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.