G - Physics – 04 – F
Patent
G - Physics
04
F
G04F 1/00 (2006.01) B32B 7/12 (2006.01) G01N 21/81 (2006.01) G01N 31/22 (2006.01) G07C 1/00 (2006.01) G09F 3/02 (2006.01)
Patent
CA 2240912
An on demand useful life indicator 10 and method providing a uniform visual change. The indicator 10 is attachable to goods or may be worn. This indicator includes a base 12; indicator material 14, impermeable adhesive 16, and a co-layered covering 18. The indicator material 14 provides a visual indication when exposed to a selected component of an ambient fluid. The indicator material 14 is intimately fixed to one side of a second layer 22 of the covering 18 in a selected pattern. The adhesive layer 16 is applied in a selected pattern between the base member 12 and the covering material 18. A permeable second layer 22 of the covering 18 is adhered to the adhesive layer 16 allowing an impermeable first layer 20 to be selectively removed therefrom. The useful life indicator remains in a selected states of dormancy until removal of the first layer 2.
Gill Peter L.
Ramsey Joseph W.
Gill Peter L.
Ramsey Joseph W.
Ridout & Maybee Llp
LandOfFree
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