Optical: systems and elements – Optical modulator – Light wave temporal modulation
Reexamination Certificate
2006-10-31
2008-03-25
Spector, David (Department: 2873)
Optical: systems and elements
Optical modulator
Light wave temporal modulation
Reexamination Certificate
active
07349137
ABSTRACT:
An optical element including:a substrate; andan at least partial coating having a first state and a second state on at least a portion of the substrate, the at least partial coating being adapted to be circularly polarizing or elliptically polarizing in at least one state and containing:a chiral nematic or cholesteric liquid crystal material having molecules that are helically arranged through a thickness of the at least partial coating; andat least one photochromic-dichroic compound that is at least partially aligned with the liquid crystal material such that a long axis of a molecule of the photochromic-dichroic compound is generally parallel to the molecules of the liquid crystal material.
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Hua
Blackburn Forrest R.
Foller Peter C.
He Meng
Kellar, II Terry A.
Kumar Anil
Altman Deborah M.
PPG Industries Ohio Inc.
Spector David
Tra Tuyen
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