Apparatus and method for producing center gated lens molds for contact lens manufacture
US5716540A · kind A · utility
28Cited by
6References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1996 |
| Grant date | Feb 10, 1998 |
| Priority date | — |
| Expiry date | Feb 9, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for the manufacture of lens molds used in the formation of optical contact lenses, the apparatus including a center gate aligned on the central axis of the lens mold cavity for delivery of the melt polymer in an axisymmetrical manner. The methodology produces lens molds of extremely precise dimensions as measured against lens molds produced with side gated technology.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.