Plural intrinsic expiration initiation application indicators
AssigneeCMC DayMark Corporation
InventorHans O. Ribi
Life of this patent
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Abstract
A device for monitoring the expiration of goods includes a substrate and an unreacted composition affixed thereto which is intrinsically reactive to one or both of its thermal environment and the length of time following activation. The reactivity results in a color formation of the composition with the color formation being a single color upon reaction to one of said thermal environment or length of time and multiple colors upon reaction to both. The device may be a label affixed to a container containing the goods to be monitored or may be printed directly on a container.
Claims8
A device for monitoring expiration of goods comprising:
- (a) a member having a surface with first and second discrete areas on said surface;
- (b) a first compound applied to said first discrete area, said first compound resulting in a first color when said member is at a first temperature and having the capability of changing to a second color upon reaching a second temperature higher than said first temperature, and to a third color which is irreversible upon reaching a third temperature higher than said second temperature;
- and
- (c) a second compound applied to said second discrete area, said second compound being reactive to both of (i) its thermal environment and (ii) the length of time following activation, said reactivity resulting in a color change, said color change being a single color upon reaction to one of (i) or (ii) and being multiple colors upon reaction to both (i) and (ii).
A device for monitoring expiration of goods comprising:
- (a) a member having a surface,
- (b) a compound applied to a zone of said surface, said compound in said zone resulting in (i) changing to a first color upon the passage of time at a first temperature, (ii) changing to a second color upon reaching a second temperature higher than said first temperature, and (iii) changing to a third color upon the passage of time following cooling from said second temperature to a third temperature;
- and,
- (c) a plurality of discrete areas on said surface outside of said zone, including a first discrete area having applied thereto an unchangeable color the same as said first color, a second discrete area having applied thereto an unchangeable color the same as said second color and a third discrete area having applied thereto an unchangeable color the same as said third color.
Dependencies are inferred from the claim text.