Sunlight dosage indicator
AssigneeQuestel Adhesives
InventorsJohn M. Questel, Christian D. Sololowski
Life of this patent
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Abstract
A multilayer sunlight dosage indicator comprising (a) an indicator layer comprising a sunlight-sensitive ink, wherein the ink undergoes a color change upon exposure to a known amount of sunlight; and (b) an overlayer comprising an amount of at least one UV absorber. A method for indicating the amount of exposure to sunlight using an indicator layer of sunlight-sensitive ink which undergoes a color change upon exposure to a known amount of sunlight and an overlayer comprising an amount of at least one UV absorber. It is possible to adjust the sensitivity of the indicator by controlling the UV absorbing materials in the overlayer.
Claims20
A multilayer sunlight dosage indicator comprising
- (a) an indicator layer comprising a sunlight-sensitive ink, wherein the ink undergoes a color change upon exposure to a known amount of sunlight;
- and
- (b) an overlayer comprising an amount of at least one UV absorber.
A method for indicating an amount of exposure to sunlight, the method comprising the step of:
- providing a multilayer sunlight dosage indicator comprising:
- (a) an indicator layer comprising a sunlight-sensitive ink, wherein the ink changes color upon exposure to a known amount of sunlight;
- and
- (b) an overlayer comprising an amount of at least one UV absorber.
A method for adjusting sensitivity of a multilayer sunlight dosage indicator, the method comprising the steps of:
- (1) providing a multilayer sunlight dosage indicator comprising:
- (a) an indicating layer comprising a sunlight-sensitive ink, wherein the ink changes color upon exposure to a known amount of sunlight;
- and
- (b) an overlayer comprising an amount of at least one UV absorber.
- (2) selecting said amount of UV absorber to alter the amount of sunlight necessary to cause the ink to change color.
Dependencies are inferred from the claim text.