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High intensity, non-reversing humidity indicator

  • US 6,663,679 B1
  • Filed: 05/23/2002
  • Issued: 12/16/2003
  • Est. Priority Date: 05/23/2002
  • Status: Active Grant
First Claim
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1. A device for monitoring humidity, comprising:

  • a) a first layer comprising a visual indicator;

    b) a second layer, covering and obscuring said first layer, said second layer comprising a deliquescent material, wherein said deliquescent material picks up moisture and dissolves itself in the moisture, becoming transparent and exposing said first layer;

    c) viewing means disposed on the opposite side of said second layer from said first layer;

    d) urging means for moving said visual indicator, wherein said urging means is activated by deliquescing of said deliquescent material;

    e) an enclosure containing said first and second layers, said spring means, and said viewing means; and

    f) an entrance to said enclosure, whereby moisture may enter and react with said deliquescent material.

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