Compositions – Light transmission modifying compositions – Displaying color change
Reexamination Certificate
2007-04-20
2009-06-09
Choi, Ling-Siu (Department: 1796)
Compositions
Light transmission modifying compositions
Displaying color change
C544S111000, C544S150000, C546S196000
Reexamination Certificate
active
07544315
ABSTRACT:
Photochromic h-annellated benzo[f]chromene compounds, especially photochromic compounds derived from benzo[f]chromenes, which compounds have particular long wavelength absorption maxima in their closed form and exhibit good performance in the open, colored form, so that good compatibility is achieved with indenonaphthopyrans which are diffused in phototropic glasses used in phototropic glass applications, and the use of such photochromic h-annellated benzo[f]chromene compounds in photochromic synthetic resin articles, particularly ophthalmic lenses.
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Melzig Manfred
Rohlfing Yven
Weigand Udo
Ahvazi Bijan
Choi Ling-Siu
Crowell & Moring LLP
Rodenstock GmbH
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