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Microstructured time dependent indicators

  • US 6,741,523 B1
  • Filed: 05/15/2000
  • Issued: 05/25/2004
  • Est. Priority Date: 05/15/2000
  • Status: Expired due to Term
First Claim
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1. An article comprising:

  • (a) a substrate having a microstructured surface, wherein the microstructured surface of the substrate defines a plurality of channels having a predetermined channel pattern;

    (b) a fluid wherein the fluid is separated from the substrate until activation of the article is desired;

    wherein the article is designed such that it can be manipulated at a desired point in time to allow contact of the fluid with at least some of the channels of the substrate in order to activate the article; and

    wherein the article is designed in such a manner as to provide an indication of the progress of fluid as it migrates through the channels of the substrate.

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