Ultraviolet light monitoring device and method of making same
AssigneeThomas C. Wright
InventorThomas C. Wright
Life of this patent
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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.
Claims20
A device for monitoring exposure to ultraviolet light, comprising:
- a base having a front surface, said surface being of a certain color;
- and
- ultraviolet light sensitive means disposed on said surface and being of a different opaque color relative to said color of said surface for concealing it from view, and for becoming transparent when exposed to ultraviolet light for a predetermined period of time.
A method of making a device for monitoring exposure to ultraviolet light, comprising:
- using a generally flat base member having first and second surfaces;
- covering the first surface with an ultraviolet light sensitive photographic emulsion material so that the first surface becomes visible to a user in such a manner to indicate a certain exposure to ultraviolet radiation only after the photographic emulsion material is exposed to a predetermined amount of ultraviolet light;
- depositing an ultraviolet light inhibiting material on a translucent material in a graduated pattern of varying density;
- and
- fusing the base member and the inhibiting material together with the ultraviolet light sensitive emulsion material in between to form a laminated structure.
A device for monitoring exposure to ultraviolet light, comprising:
- a generally flat base member having a first outer surface to be viewed by a user and a second outer surface;
- adhesive means attached to the second surface for attaching the base member removably to the skin or clothing of the user;
- ultraviolet light sensitive means, including an ultraviolet light sensitive photographic emulsion material disposed upon the first surface so that the first surface becomes visible to the user only after the ultraviolet light sensitive emulsion material is exposed to a predetermined amount of ultraviolet light;
- filter means, including an ultraviolet light inhibiting material juxtaposed in overlying relationship relative to said light sensitive means, and having a graduated pattern of varying opacity, for inhibiting passage selectively of ultraviolet light to the ultraviolet light sensitive emulsion material according to the graduated pattern, to cause the first surface to become exposed to view in a series of gradations indicative of a cumulative amount of ultraviolet light exposure;
- a protective translucent material disposed over said filter means;
- and
- said filter means and base member being bonded together with said emulsion material disposed therebetween.
Dependencies are inferred from the claim text.