Method and apparatus for removing a contact lens from a plastic mold
US4909969A · kind A · utility
11Cited by
3References
9Claims
0Family size
Inventor
Key dates
| Filing date | Aug 23, 1989 |
| Grant date | Mar 20, 1990 |
| Priority date | — |
| Expiry date | Aug 23, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Fabrication of contact lenses whereby the yield of lenses removed from plastic casting molds is significantly increased. In fabricating contact lenses where a lens is initially formed in a plastic casting mold, the mold is compressed to a degree sufficient to initiate permanent deformation of the mold material, in progressive steps, incrementally decreasing in diameter from a starting diameter substantially larger than the diameter of the molded lens, until the lens self-detaches from the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.