Silicone hydrogel contact lenses

US8820928B2 · kind B2 · utility

Assignee

• COOPERVISION INTERNATIONAL LIMITED · GB

Inventors

• Arthur Back · Danville, US
• David Robert Morsley · Eastleigh, GB
• Richard C. Rogers · Eastleigh, GB
• Sarah Almond · Southampton, GB
• Charlie Chen · San Ramon, US
• Yuwen Liu · Dublin, US
• Charles A. Francis · Union City, US
• Ye Hong · Pleasanton, US

Key dates

• Filing date: Feb 24, 2012
• Grant date: Sep 2, 2014
• Expiry date: Dec 26, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G77/46
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Silicone hydrogel contact lenses are produced without using volatile organic solvents to extract materials from the polymerized contact lens bodies, and instead are washed with aqueous liquids. The silicone hydrogel contact lenses so produced have ophthalmically wettable lens surfaces such that less than five percent of a batch of twenty or more such silicone hydrogel contact lenses have visually identifiable non-wetting spots when the contact lenses are located on eyes of subjects.