Method of press molding lens material
US5032160A · kind A · utility
19Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 5, 1989 |
| Grant date | Jul 16, 1991 |
| Priority date | — |
| Expiry date | Oct 5, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0016
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A lens molding method where a lens material is set between an upper mold and a lower mold, and the molding pressure is reduced or made zero at least once during a heating & pressing step without the mold surfaces breaking contact with the lens materials, and during a cooling & pressing step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.