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US 4,900,366 AGranted
Method for cleaning contact lens with dissolving abradant
AssigneePilkington Visioncare Holdings, Inc.
InventorsMurray J. Sibley, Rebecca F. Nite
Life of this patent
Estimating the term…
Abstract
A composition is disclosed useful for cleaning hard and soft contact lenses, in which cleansing action is provided by a relatively soft abradant particulate sparingly soluble room temperature solid organic acid or inorganic salt, preferably in combination with one or more surfactants. The particulate material effectively removes deposits from the lens, and readily dissolves on the application of water.
Claims4
The method of removing surface deposits from a contact lens comprising
- (a) rubbing the lens surface with a composition that comprises an effective amount of particles of a water soluble non-toxic physiologically acceptable inorganic abradant component where said abradant is boric acid or borate salts or mixtures thereof soluble in water in an amount less than about 30 weight percent at 40.degree. C. and less than about 10 weight percent at 20.degree. C. having a particle size from about 10 to less than about 210 microns where at least 98 percent are about 105 microns or smaller and a hardness up about 6 (Mohs);
- said composition also comprising a surfactant component and an amount of liquid less than that required to dissolve at 25.degree. C. the entire amount of said abrandant;
- and then
- (b) removing said composition and removed deposits from the lens surface.
1 more element
Dependencies are inferred from the claim text.