Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1999-06-11
2000-10-31
Sugarman, Scott J.
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359245, 359246, G02F 103
Patent
active
061411353
ABSTRACT:
A photochromic composition which develops a neutral tint such as grey, green, brown or amber upon the irradiation with light including ultraviolet rays such as sunlight starting from the initial colorless state, maintaining a homogeneous color tone in the transient stage of developing color. The photochromic composition comprises 100 parts by weight of a fulgimide compound and/or a fulgide compound, and from 10 to 300 parts by weight of a chromene compound having a molar extinction coefficient of not smaller than 150 L/mol-cm for light of a wavelength of 400 nm.
REFERENCES:
patent: 4994208 (1991-02-01), Mcbain
patent: 5981634 (1999-11-01), Smith
Patent Abstracts of Japan, vol., 015, No. 317, Aug. 13, 1991 & JP 03 121188A (Tokuyama Soda Co., Ltd.) May 23, 1991 (Abstract).
Kawabata Yuichiro
Momoda Junji
Nagoh Hironobu
Lucas Michael A.
Sugarman Scott J.
Tokuyama Corporation
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