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Interrogator and interrogation system employing the same

  • US 7,541,933 B2
  • Filed: 08/13/2007
  • Issued: 06/02/2009
  • Est. Priority Date: 03/03/2003
  • Status: Expired due to Term
First Claim
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1. A sponge, comprising:

  • first and second layers of absorbent material that form an interior space;

    a radio frequency identification (RFID) tag affixed to said absorbent material within said interior space;

    a liquiphobic designator affixed to at least one of said first and second layers of said absorbent material; and

    a radiopaque object affixed to at least one of said first and second layers of said absorbent material.

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