Signals and indicators – Indicators – Chemically activated type
Patent
1995-07-25
1997-05-20
Will, Thomas B.
Signals and indicators
Indicators
Chemically activated type
426 87, G01D 2100
Patent
active
056303726
ABSTRACT:
An improved on demand useful life indicator that may be attached to or placed in manufactured goods at a selected time. This indicator includes a base member; an indicating material layer, an adhesive layer, and a co-layered covering material. The indicating material layer is formulated to provide a visual indication when exposed to a selected component of an ambient fluid. The indicating material is applied to one side of the impermeable base member in a selected pattern. The adhesive layer is made of an impermeable material and applied in a selected pattern over the indicating material layer so that at least one selected portion of the indicating material is exposed to the ambient fluid. An inner layer of the co-layered cover member has a greater adhesion to the adhesive layer when an impermeable outer layer is removed. The inner layer is permeable to the ambient fluid. The useful life indicator remains in a selected state of dormancy until the outer layer of the co-layered cover member is removed. This useful life indicator may include a self-contained norm of visual indication.
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Gill Peter L.
Ramsey Joseph W.
Hirshfeld Andrew
Pinto Patrick J.
Will Thomas B.
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