Compositions – Light transmission modifying compositions – Displaying color change
Reexamination Certificate
2006-03-07
2006-03-07
Tucker, Philip C. (Department: 1712)
Compositions
Light transmission modifying compositions
Displaying color change
C549S381000, C549S330000, C549S331000, C549S354000, C546S041000, C548S417000, C540S576000
Reexamination Certificate
active
07008568
ABSTRACT:
A photochromic naphthopyran displays good color distribution when the naphthopyran has a central nucleus of the formula:wherein F is a 5-member, 6-member, or 7-member heterocyclic ring group having only one heteroatom, the heteroatom selected from the group consisting of oxygen, sulfur, and nitrogen, the 2,3 or 3,2 positions of the heterocyclic ring fused to the g, h, or i side;R1and R2are the atoms or groups providing photochromic properties to the naphthopyran.
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Mark A. Litman & Associates P.A.
Tucker Philip C.
Vision--Ease Lens, Inc.
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