Ultraviolet cycling oven for polymerization of contact lenses
US5597519A · kind A · utility
56Cited by
16References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1994 |
| Grant date | Jan 28, 1997 |
| Priority date | — |
| Expiry date | Jun 10, 2014 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C2035/0827
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method and apparatus for molding contact lenses by curing polymerizable compositions in suitably dimensioned molds using ultraviolet or other polymerization-inducing radiation and heat. The molds are moved along a source of radiation such that the intensity of the radiation to which the composition is exposed rises and falls several times, thereby achieving superior results by balancing the initiation and the propagation of the polymerization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.