Method and apparatus for uniformly dispersing articles in a treatment solution
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United States of America Patent
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Oct 20, 1998
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N/A
app pub date -
Apr 8, 1996
filing date -
Dec 5, 1994
priority date (Note) -
Expired
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Abstract
An apparatus and method for uniformly contacting an article with a treatment solution. Preferred embodiments are methods of uniformly tinting of contact lenses or uniformly surface modifying contact lenses. The method involves suspending the lens in the treatment solution by application of fluid flow, preferably sinusoidal or pulsed, in a direction opposite the stagnant force (i.e., sum of buoyancy and gravity forces) on the article. The fluid flow prevents the lens from contacting the container structure for periods sufficient to cause non-uniform treatment conditions, while continuously mixing the treatment solution to maintain uniform concentrations throughout.
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