Mold material made with additives
US5849209A · kind A · utility
161Cited by
6References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1995 |
| Grant date | Dec 15, 1998 |
| Priority date | — |
| Expiry date | Sep 29, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention is directed to a composition of polystyrene or polypropylene with at least 0.5% (w/w)of an additive or wetting agent, the article of manufacture comprised thereof, such as a mold for making contact lenses and the mold assembly containing said mold, and the use of such mold so to minimize defects, such as holes, puddles, chips and tears in the lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.