Ophthalmic lens mold seal
US5238388A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1991 |
| Grant date | Aug 24, 1993 |
| Priority date | — |
| Expiry date | Dec 6, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for molding a soft ophthalmic lens, having a male and 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. The two portions are mated 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 contact area. The mold portion containing 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.