Method for tinting a hydrophilic contact lens
AssigneeCiba-Geigy Corporation
InventorsRichard D. Auten, Robert A. Janssen, Leslie F. Stebbins, Richard C. Turek
Life of this patent
Estimating the term…
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.
Claims5
A method of tinting an unhydrated contact lens, comprising the steps of:
- a) providing an unhydrated contact lens;
- b) providing a dyestuff solution;
- c) providing a printing block comprising a hydrophilic polymer material containing a dye complexing agent capable of noncovalently bonding the dyestuff;
- d) placing the dyestuff solution onto the printing block;
- e) contacting the unhydrated contact lens and the printing block for a time sufficient to allow the dyestuff solution to diffuse to the lens;
- and
- f) removing the lens from the printing block.
Dependencies are inferred from the claim text.