Ultraviolet light monitoring device and method of making same

Details Ultraviolet light monitoring device and method of making same Ultraviolet light monitoring device and method of making same

1987-01-12

1988-11-29

Fields, Carolyn E.

Radiant energy

Invisible radiation responsive nonelectric signalling

Optical change type

2504821, G01J 148

Patent

active

047884339

ABSTRACT:
An ultraviolet light sensitive emulsion material, which becomes transparent to the user only after the ultraviolet light sensitive emulsion material is exposed to a predetermined amount of ultraviolet light, to expose a colored backing surface to view. In one form of the invention, an ultraviolet light inhibiting material is disposed in covering or blocking relationship relative to the emulsion material arranged in a graduated pattern of varying opacity, for inhibiting passage of ultraviolet light selectively to the ultraviolet light sensitive emulsion material to enable the emulsion to be rendered transparent in a series of graduated indications when the device is exposed to progressively longer periods of time.

REFERENCES:
patent: 3194963 (1965-07-01), McKee
patent: 3886415 (1975-05-01), Genthe
patent: 3903423 (1975-09-01), Zweig
patent: 4187424 (1980-02-01), Inoue et al.
patent: 4247575 (1981-01-01), O'Connell et al.

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