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Chemical preconcentrator

  • US 6,171,378 B1
  • Filed: 08/05/1999
  • Issued: 01/09/2001
  • Est. Priority Date: 08/05/1999
  • Status: Expired due to Term
First Claim
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1. A chemical preconcentrator apparatus, comprising:

  • (a) a substrate having a suspended membrane formed thereon;

    (b) a resistive heating element disposed on a surface of the membrane; and

    (c) a sorptive material disposed on at least one surface of the membrane to sorb and concentrate at least one chemical species of interest from a vapor over time, with the chemical species being releasable from the sorptive material upon heating of the sorptive material by the resistive heating element.

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