Annular gated mold for the injection molding of contact lenses
US5928682A · kind A · utility
14Cited by
6References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1995 |
| Grant date | Jul 27, 1999 |
| Priority date | — |
| Expiry date | Dec 21, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29D11/00125
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for the manufacture of optical polymer contact lenses in a closed mold, where a mold cavity is created between a front curve insert and a back curve insert, the side walls of the mold cavity being formed by the inner wall of a movable annular gate collar, the collar being positioned in a retracted position during polymer dosing and then moved prior to polymer cure into an extended position to complete the mold cavity and to separate the polymer curing inside the mold cavity from any waste polymer outside of the mold cavity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.