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Apparatus for detecting the presence of a liquid

  • US 5,463,377 A
  • Filed: 10/08/1993
  • Issued: 10/31/1995
  • Est. Priority Date: 10/08/1993
  • Status: Expired due to Fees
First Claim
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1. An apparatus for detecting the presence of a liquid in a region, said apparatus comprising:

  • a first electrically conducting circuit;

    a second electrically conducting circuit spaced apart from said first circuit and having a first terminal and an opposing, spaced-apart second terminal;

    a switch for connecting said first and second terminals of said second circuit, said switch completing said second circuit when exposed to said liquid;

    means electrically connected to said first circuit for generating a first alternating current having a first resonant frequency in said first circuit, said first alternating current inducing a second alternating current in said second circuit when said second circuit is placed in said region, said first circuit is brought close to said second circuit and said switch is closed, said second alternating current causing a change in said first resonant frequency of said first circuit to a second resonant frequency; and

    means for indicating closure of said switch by exposure to said liquid, said indicating means indicating said change from said first resonant frequency to said second resonant frequency.

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