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US 8,207,244 B2Granted
Visible light absorbers for ophthalmic lens materials
AssigneeNovartis AG
InventorWalter R. Laredo
Life of this patent
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Abstract
Azo compounds that block visible light are disclosed. These light absorbers are particularly suitable for use in intraocular lens materials.
Claims18
An azo compound of the formula
- wherein
- X1, X2, and X3 independently=H, C1-C6 alkyl, C1-C6 alkoxy, phenoxy, or benzyloxy;
- Y=H, F, Cl, Br, I, or C1-C6 alkyl;
- W=nothing or —O—C(═O)—NH—CH2—CH2—;
- and
- Z=H, CH3, C2H5, or CH2OH.
3 more elements
Dependencies are inferred from the claim text.