Polishing of optical and non-optical tools for improved mold flow
US8002608B2 · kind B2 · utility
1Cited by
9References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2007 |
| Grant date | Aug 23, 2011 |
| Priority date | — |
| Expiry date | Jan 31, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
This invention is related to the process of polishing the optically critical surface of the front piece as well as the back piece, or non-optical surface, used to make molds used in double-sided molding process to make contact lens for reducing warpage of the mold, radius changes in different cavities and amount of cylindrical distortion. The polishing of both of the front piece and back piece causes the mold material to see a very similar coefficient of friction on both top and bottom surface and provides uniform flow front.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.