Method for injection molding lenses
US4091057A · kind A · utility
70Cited by
5References
8Claims
0Family size
Inventor
Key dates
| Filing date | Sep 1, 1976 |
| Grant date | May 23, 1978 |
| Priority date | — |
| Expiry date | Sep 1, 1996 |
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 injection molding thermoplastic lenses, such as prescription eyeglass lenses, in a single injection molding operation into a finished single vision or multifocal blank which does not require additional molding or polishing. Movable optical inserts (dies) are forced apart by injected polycarbonate, then the inserts are urged together forcing a portion of the injected polycarbonate into a pocket.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.