×

Portable, disposable warning device for detecting urine-wet undergarments

  • US 4,539,559 A
  • Filed: 03/29/1982
  • Issued: 09/03/1985
  • Est. Priority Date: 03/29/1982
  • Status: Expired due to Fees
First Claim
Patent Images

1. A portable electronic device with a disposable sensor for producing a signal when an undergarment is wet with urine, which comprises, in combination(a) a sensor circuit comprising(i) separated electric terminals mounted to facilitate contact with said undergarment,(ii) conducting leads connected to said terminals,(iii) said leads being connected together through a voltage source and a resistance means,(iv) said resistance means having a resistance value at least ten times the resistance to be expected between said terminals when in contact with said urine-wet undergarment,(v) the voltage from said voltage source and the resistance in said resistance means being chosen such that, in combination with the resistance between said terminals, no more than 10 microamperes of current can flow in said sensor circuit;

  • (b) an oscillating means connected to said sensor circuit in such manner that said oscillating means oscillates only when current passes in said sensor circuit, and(c) an indicating means connected through an inverting means to said oscillating means.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×