Inspection and testing indicator

Details Inspection and testing indicator Inspection and testing indicator

2011-01-25

2011-11-15

Smith, R. A. (Department: 2841)

Signals and indicators

Indicators

Chemically activated type

C368S327000

Reexamination Certificate

active

08056498

ABSTRACT:
An indicator is disclosed that detects the presence of a chemical residue. The indicator includes a substrate having an upper surface and a lower surface and a first portion and a second portion joined at a fold line. The first portion is smaller in area than the second portion. An adhesive coats the upper surface of at least the second portion of the substrate. A first reactant is adhered to the upper surface of the first portion of the substrate. When the second portion is contacted with a surface containing the chemical residue, the residue adheres to the adhesive and when the first portion is subsequently folded along the fold line so that the upper surfaces of the substrate contact each other, a portion of the adhesive on the second portion remains exposed and the first reactant and chemical residue react to provide the color indicia indicating the presence of the chemical residue.

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