IP Library › Granted Patent US 8,323,631
Granted Patent B2
US 8,323,631 · App. 13/186,079 · Granted Dec 4, 2012

UV-absorbers for ophthalmic lens materials

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Quick Facts
Patent No.
US 8,323,631
App. No.
13/186,079
Granted
Dec 4, 2012
Kind
B2
Abstract

Dihydroxybenzotriazole UV absorbing compounds that are particularly useful in ophthalmic devices are disclosed.

Claims (14)

1. A UV absorber of the formula

wherein

X 1 is O;

R 1 is CH 3 ;

X 2 is a polymerizable group of formula Ia;

the polymerizable group of formula Ia is:

R 4 is t-butyl;

R 5 is H;

R 6 is t-butyl;

R 7 is (CH 2 ) 3 ;

X 4 is O;

R 8 is C(═O);

R 9 is CH 3 ; and

R 10 is H.

Assignments (1)
CONFIRMATORY DEED OF ASSIGNMENT EFFECTIVE APRIL 8, 2019 Recorded Dec 10, 2019
From: NOVARTIS AG
To: ALCON INC.
Reel/Frame 051454/0788 →