Radiant energy – Invisible radiation responsive nonelectric signalling – Optical change type
Patent
1995-06-07
1997-03-18
Fields, Carolyn E.
Radiant energy
Invisible radiation responsive nonelectric signalling
Optical change type
G01J 138
Patent
active
056125429
ABSTRACT:
The present invention provides a personal, portable and self-powered ultraviolet light intensity (UVI) monitor and a method for determining the duration of safe exposure to the sun or, alternatively, the value of the sun protection factor (SPF) of a sun protection product required for a given duration of exposure to the sun. The monitor is a substrate imprinted with indicia and non-uniformly overlaid with photosensitive material. Depending on the intensity of UV light to which the monitor is exposed, the photosensitive material changes physical characteristics and exposes some and conceals other indicia to indicate a duration of safe exposure to the sun for given conditions or the SPF value of the sun protection product used to be used, or both.
REFERENCES:
patent: 3787687 (1974-01-01), Trumble
patent: 4863282 (1989-09-01), Rickson
patent: 5296275 (1994-03-01), Goman et al.
Joyce, Marilyn "Sticker Tells You When To Reapply The Sunscreen: Sun Spots Product Which Changes Colour When Sunscreen Reapplication Is Needed, " Philadelphia Business Journal, Jun. 17, 1994, vol. 13, No. 16, p. 3, column 2.
SunDog Promotional Piece, Distributed at Commonwealth Games, Victoria British Columbia, Summer 1994.
A SunCast.TM. UV Monitor Sales brochure, Orbital Sciences Corp., Undated.
A SunCast .TM. UV Monitor Sales brochure, Advanced Safety Devices, Inc., Undated.
"New UV Forecast Could Brighten Sun Case Sales", Drug Store News, Mar. 13, 1995.
Newsbites, Drug Store News, Jun. 5, 1995, p. 15.
Sunwatch UV Monitor, TWICE, Apr. 24, 1995, p. 94.
Brown John F.
Gawne Steve P.
649020 Alberta Ltd.
Fields Carolyn E.
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