Compositions – Light transmission modifying compositions – Displaying color change
Patent
1996-07-31
1998-06-02
Richter, Johann
Compositions
Light transmission modifying compositions
Displaying color change
549389, 524110, 524109, 544150, 544378, 546196, G02B 523, G02B 2400
Patent
active
057594503
ABSTRACT:
A naphthopyran compound represented by the formula: ##STR1## wherein R.sub.5, R.sub.6, R.sub.8, R.sub.9, and R.sub.10 are each selected from hydrogen, a first stable organic radical, an organic heterocyclic group, halogen, a first nitrogen-substituted group, and a first nitrogen-substituted ring compound; A and B are each selected from hydrogen, substituted phenyl, and substituted naphthyl, provided that at least one of A or B is substituted phenyl or substituted naphthyl; and any substituent of any substituted phenyl or substituted naphthyl at A or B is selected from hydrogen, a second stable organic radical, an organic heterocyclic group, halogen, a second nitrogen-substituted group, and a second nitrogen-substituted ring compound, provided that at least one substituent of any substituted phenyl or substituted naphthyl at either A or B is phenyl, naphthyl, or furyl.
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patent: 5066818 (1991-11-01), Gemert et al.
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patent: 5238981 (1993-08-01), Knowles
patent: 5244602 (1993-09-01), Van Gemert
patent: 5274132 (1993-12-01), VanGemert
patent: 5531935 (1996-07-01), Hughes et al.
Hughes Frank J.
Travnicek Edward A.
Richter Johann
Stockton Laura L.
Vision--Ease Lens, Inc.
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