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US 4,394,179 AGranted
Abrasive-containing contact lens cleaning materials
AssigneePolymer Technology Corporation
InventorsEdward J. Ellis, Joseph C. Salamone
Life of this patent
Estimating the term…
Abstract
New cleaning solutions for contact lens have a surface active agent, an inorganic abrasive, and a suspending agent to provide a suspension in an aqueous solution or organic liquid.
Claims3
A method of cleaning an ophthalmic hard contact lens, said method comprising,
- applying an aqueous cleaning solution containing a silica gel abrasive having an average particle size of no more than 20 microns of a particle size sufficient for use in lens polishing, a suspending agent and a surface active agent in an amount of from about 0.1 to about 30% by weight to a surface of said lens and abrading said surface to remove unwanted surface deposits if present without changing the power of said contact lens said abrasive being present in an amount of from about 0.1% by weight to under 10% by weight,
- said suspending agent being selected from the class consisting of inorganic salts and hydrophilic polymers.
A method of cleaning an ophthalmic hard contact lens, said method comprising,
- applying an aqueous cleaning solution containing a silica gel abrasive having an average particle size of no more than 10 microns of a particle size sufficient for use in lens polishing present in an amount of from 0.1% by weight to a value below that which would cause damaging scratching or changing of the power of the lens,
- a surface active agent in an amount of from 0.1 to 30% by weight and a separate suspending agent to a surface of a lens and abrading said surface to remove unwanted surface deposits if present without changing the power of the lens or adversely affecting or scratching said lens,
- said suspending agent being selected from the class consisting of inorganic salts and hydrophilic polymers.
Dependencies are inferred from the claim text.