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US 4,215,010 AGranted
Photochromic compounds
AssigneeAmerican Optical Corporation
InventorsRichard J. Hovey, Nori Y. C. Chu, Peter G. Piusz, Charles H. Fuchsman
Life of this patent
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Abstract
Photochromic compounds of the formula ##STR1## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen and their use in lenses are disclosed.
Claims14
A compound having the formula;
- ##STR3## wherein one of R.sub.1 and R.sub.2 is halogen or lower alkoxy, and the other is hydrogen, and R.sub.3 and R.sub.4 are hydrogen, lower alkyl, lower alkoxy, or halogen.
A photochromic optical element comprising, (A) a transparent plastic host and (B) an effective amount of photochromic compound selected from the group consisting of 1,3,3-trimethyl-9'-methoxy-;
- 1,3,3-trimethyl-9'-ethoxy-;
- 1,3,3-trimethyl-8'-bromo-;
- 1,3,3,5-tetramethyl-9'-methoxy-;
- 1,3,3,6-tetramethyl-9'-methoxy-;
- 1,3,3,7-tetramethyl-9'-methoxy-;
- 1,3,3,4,5-pentamethyl-9'-methoxy;
- 1,3,3,5,6-pentamethyl-9'-methoxy-;
- 1,3,3,4,7-pentamethyl-9'-methoxy-;
- 1,3,3,5,7-pentamethyl-9'-methoxy-;
- 1,3,3,6,7-pentamethyl-9'-methoxy-;
- 1,3,3-trimethyl-5,9'-dimethoxy-;
- 1,3,3-trimethyl-4,7,9'-trimethoxy-;
- 1,3,3-trimethyl-5-chloro-9'-methoxy-;
- 1,3,3,4,5-pentamethyl-8'-bromo-;
- 1,3,3,5,6-pentamethyl-8'-bromo-spiroindolinenaphthooximes and mixtures thereof.
12 more elements
Dependencies are inferred from the claim text.