Industrial production of cast plastic lenses
US4146696A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1978 |
| Grant date | Mar 27, 1979 |
| Priority date | — |
| Expiry date | Feb 27, 1998 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0016
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The process of the preparation of production quantities of lens devices fabricated from synthetic resinous substances, normally referred to as "plastic lenses." The process utilizes a molding formulation which enables reusable mold cavities to be utilized, the formulation providing a proper balance between a number of processing parameters or variables, one of the primary parameters being the maintenance of a proper adherence or release capability between the surface of the lens being fabricated and the surface of the mold cavity. Specifically, it has been found that certain silanes when incorporated in the molding formulation controls the parameters so as to provide for controllable release of the lens product from the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.