Photochromic Compounds
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United States of America Patent
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Jul 21, 2016
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Jan 18, 2016
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Jan 19, 2015
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Abstract
Described are novel photochromic naphthopyran compounds which exhibit a red coloring when in a red-colored state achieved upon exposure to ultraviolet light, whereby the red coloring has a lambda max in a range of between about 490 nanometers to about 510 nanometers or between about 490 nanometers to about 500 nanometers.
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