Apparatus for making plastic molds
US5620717A · kind A · utility
9Cited by
23References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 29, 1996 |
| Grant date | Apr 15, 1997 |
| Priority date | — |
| Expiry date | Jul 29, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S425/808
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An improved method for forming plastic molds for casting articles having an optical surface such as contact lenses employs a plastic tool having an optically smooth surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.