Articles employing photochromic materials

Details Articles employing photochromic materials Articles employing photochromic materials

1975-12-29

1976-10-05

Webster, Robert J.

Compositions

Radioactive compositions

Nuclear reactor fuel

350147, 96 90PC, 252300, 260348C, 106 93, G02C 710, G02B 528, F21V 900

Patent

active

039841774

ABSTRACT:
Articles are described which utilize a unique photochemical property of a certain class of heterocyclic compounds. These heterocyclic compounds are the mono- and bicyclic aziridines. Oriented crystals of these heterocyclic compounds are photochromic in an unusual way. The effect of the excitation radiation and the strength of the resulting absorption band responsible for the appearance of color depend on the polarization of the radiation. These articles contain at least one optically smooth surface. Typical articles are windshields or glass panes which darken on being exposed to glare and sunglasses. Switching devices are also described which exist in two states; one state characterized by absorption of certain radiation over wavelength range and the other state by high transparency.

REFERENCES:
patent: 3329502 (1967-07-01), Ullman et al.
patent: 3528926 (1970-09-01), Vanvoorhis et al.
patent: 3609165 (1971-09-01), Heine
patent: 3772284 (1973-11-01), Singh et al.

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