Method for forming plastic optical quality spectacle lenses
US5178800A · kind A · utility
85Cited by
10References
16Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 10, 1990 |
| Grant date | Jan 12, 1993 |
| Priority date | — |
| Expiry date | Oct 10, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/0073
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A fast, relatively inexpensive method and simple is disclosed for producing a finished plastic multifocal or progressive lens from a preformed lens which has a predetermined lens correction (i.e., curvature or prescription) at its optical center. The disclosed method produces a finished lens which has a multifocal or progressive region without changing the lens correction at the optical center of the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.