Method for tinting a hydrophilic contact lens
US5266077A · kind A · utility
16Cited by
9References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 9, 1992 |
| Grant date | Nov 30, 1993 |
| Priority date | — |
| Expiry date | Nov 9, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C7/021
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A method of tinting an unhydrated contact lens involves the steps of providing an unhydrated contact lens; providing a dyestuff solution; providing a printing block comprising a hydrophilic polymer material containing a dye complexing agent capable of noncovalently bonding the dyestuff; placing the dyestuff solution onto the printing block; contacting the unhydrated contact lens and the printing block for a time sufficient to allow the dyestuff solution to diffuse to the lens; and removing the lens from the printing block.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.