Photochromic composition containing a diphenyl dibenzochrom-3-en

Details Photochromic composition containing a diphenyl dibenzochrom-3-en Photochromic composition containing a diphenyl dibenzochrom-3-en

1974-05-08

1976-08-10

Louie, Jr., Won H.

Gas separation: apparatus

Electric field separation apparatus

Electrode cleaner, apparatus part flusher, discharger, or...

96 48QP, 96119PQ, 96 15, 96 90PC, 252300, 260239R, 2603452, 260327R, 260327H, G03C 152

Patent

active

039739660

ABSTRACT:
Disclosed are novel imaging imaging comprising photochromic compounds of the formula: ##SPC1##
Wherein X is selected from the group consisting of oxygen, sulfur and selenium; and wherein R.sub.1 and R.sub.2 are individually selected from the group consisting of a substituted or unsubstituted lower alkyl of 1-8 carbon atoms or a substituted or unsubstituted phenyl group. The photochromic compounds are responsive to light in the visible and ultraviolet region of the spectrum.

REFERENCES:
patent: 3359103 (1967-12-01), Becker et al.
patent: 3642479 (1972-02-01), Van Allan et al.

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