Method of forming an opthalmic lens from a synthetic material blank
US5100590A · kind A · utility
34Cited by
13References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1989 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Oct 13, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
In a method of forming an ophthalmic lens from a synthetic material blank, in particular from a polycarbonate material, the blank is placed horizontally in a mold having optically finished molding surfaces. It is then subjected to a molding force at raised temperature in an oven. The mold has an upper molding surface that is part of a shell member adapted to slide freely in a ring. The molding force is limited to the static force due to the weight of the shell member, optionally increased by the weight of a pre-load mass surmounting the shell member.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.