Method for cast moulding contact lenses with a rounded edge form
US6923538B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 2002 |
| Grant date | Aug 2, 2005 |
| Priority date | — |
| Expiry date | Mar 12, 2023 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2011/0041
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Methods for producing contact lenses include providing a back surface tool having a surface generally corresponding to a desired contact lens surface and a convex curve along an outer radius thereof, positioning the tool in a molding apparatus, introducing a moldable material into the molding apparatus to form a first mold section having a negative impression of the surface of the tool, assembling the first mold section with a second mold section to form a lens shaped cavity therebetween and forming a contact lens member in the lens shaped cavity of the assembled mold sections. Molds useful in producing contact lenses, tools useful in making mold sections for molding contact lenses and contact lenses having rounded edge surfaces are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.