Residual life indicator
First Claim
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1. A residual life indicator for indicating the useful life remaining in a synthetic or natural filtering agent after exposure to contaminants, the residual life indicator comprising:
- a solid, surface active, waterproof, support medium having a concentric pattern imprinted thereon wherein the concentric pattern comprises a center pattern and at least one outer pattern; and
an indicator dye disposed within the center pattern of the concentric pattern wherein the indicator dye is carried out across the solid, surface active, waterproof, support medium toward the outer pattern by the contaminants to which the indicator dye has been exposed.
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Abstract
The present invention is directed toward a residual life indicator. The residual life indicator comprises a solid, surface active, waterproof support medium having a concentric pattern imprinted thereon. The concentric pattern comprises a center pattern and at least one outer pattern. An indicator dye spot is disposed within the center pattern of the concentric patter. When the indicator dye is exposed to contaminants, the indicator dye spot visually moves toward the outer pattern.
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20 Claims
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1. A residual life indicator for indicating the useful life remaining in a synthetic or natural filtering agent after exposure to contaminants, the residual life indicator comprising:
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a solid, surface active, waterproof, support medium having a concentric pattern imprinted thereon wherein the concentric pattern comprises a center pattern and at least one outer pattern; and
an indicator dye disposed within the center pattern of the concentric pattern wherein the indicator dye is carried out across the solid, surface active, waterproof, support medium toward the outer pattern by the contaminants to which the indicator dye has been exposed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A residual life indicator for indicating the useful life remaining in a synthetic or natural filtering agent after exposure to contaminants, the residual life indicator comprising:
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a solid, smudge-proof, waterproof, surface active, support medium disposed on a side of a polypropylene support wherein the solid, smudge-proof, waterproof, surface active, support medium has a concentric pattern disposed thereon, wherein the concentric pattern comprises a center circle and a plurality of outer marks, wherein each outer mark is indexed to the residual capacity of a carbon bed;
an indicator dye disposed within the center circle, wherein the indicator dye is carried out across the solid, smudge-proof, waterproof, surface active, support medium toward the outer marks by the contaminants to which the indicator dye has been exposed; and
a fastener disposed on a side of the polypropylene support opposite from the side having the smudge-proof, waterproof, surface active, support medium having a concentric pattern disposed thereon.
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20. A process for detecting useful life remaining in a synthetic or natural filtering agent, the process comprising the steps of:
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a) providing a residual life indicator for indicating the useful life remaining in a synthetic or natural filtering agent after exposure to contaminants, the residual life indicator comprising;
a solid, smudge-proof, waterproof, surface active, support medium having a concentric pattern imprinted thereon wherein the concentric pattern comprises a center pattern and at least one outer pattern; and
an indicator dye disposed within the center pattern of the concentric pattern wherein the indicator dye is carried out across the solid, smudge-proof, waterproof, surface active, support medium toward the outer pattern by the contaminants to which the indicator dye has been exposed;
b) exposing the residual life indicator to organic vapors; and
c) watching the indicator dye spread and move toward the outer pattern.
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Specification